As a whole, the source of thoughts and imagination is called the thinking aggregate. Every thought or small mental movement appears briefly in the mind and then disappears. By themselves, these mental movements have no fixed meaning. They simply arise for a moment in awareness and then vanish without leaving anything behind. Only when the memory and interpretation aggregate takes hold of them do they become thoughts and ideas with clear meaning and content. This aggregate is responsible for memory, recognition, and interpretation. It takes small fragments of thought, interprets them, expands on them, and gives them importance, turning them into issues and stories. Then the thinking aggregate continues building upon these issues through endless mental chatter. However, memory and interpretation are the main cause behind the process. As soon as a thought appears, memory immediately grabs it, labels it as something, and begins disturbing the mind. These two mental activities are the main source of trouble. Together they create stories of happiness and suffering, then convince us that these stories are real and belong to us. By relying on memory to recognize everything appearing in awareness, the mind gives meaning to experiences and becomes attached to them.
Thoughts arise and disappear with clear beginnings and endings, like flashes of lightning or fireflies blinking on and off. When observed carefully, the memory and interpretation aggregate is much more subtle than the thinking aggregate. Thoughts burst quickly into awareness and form the basic material for thinking. Memory and interpretation, however, are not experienced as quick flashes. When the mind is completely still and mental activity becomes very quiet, we can clearly observe how each mental process arises. Memory and interpretation slowly spread through the Citta like ink spreading through paper, gradually expanding until a mental image forms. Following this process, thoughts begin constructing stories around those images, and those stories eventually seem to take on a life of their own. Thinking about anything always begins when memory recognizes and interprets small mental movements, shaping them into recognizable images that thoughts then continue to expand upon. Both of these mental activities are natural processes. They arise on their own and are separate from the awareness that knows them.
When the Citta has investigated these mental processes repeatedly, continuously, and without stopping, it gradually becomes highly skilled. Through wisdom, we first let go of attachment to the physical body. In the beginning stages of investigation, wisdom sees through the body before it fully sees through the other mental aggregates. Later, the Citta gradually releases attachment to feelings, memory, thoughts, and consciousness in the same way.
Simply speaking, the Citta lets go only when wisdom fully understands the mental components of personality. Before wisdom clearly sees them, the Citta continues clinging to them. Once wisdom penetrates them completely, the Citta releases them all, realizing they are merely temporary mental movements within the Citta and possess no real substance. Whether thoughts are good or bad, they all arise and disappear in exactly the same way. No matter how thoughts appear, they are only temporary creations formed by memory and thought, and they always vanish. There are no exceptions. No thought lasts longer than a brief instant. Since thoughts have no lasting duration, they also have no true substance or reliable meaning. Therefore, they cannot be trusted.
So what keeps producing these endless thoughts? What continues creating them moment after moment? One thought appears, then another follows, constantly deceiving us. They come from sights, sounds, tastes, smells, bodily sensations, feelings, memories, thoughts, and consciousness. We automatically believe the assumptions we make about our experiences, continuing the deception until it burns within our hearts like fire. The Citta becomes contaminated by these mental habits and assumptions.
The purpose of investigation is to remove these contaminating factors. When they disappear, the true nature of the Citta becomes visible. We then see that whenever the Citta does not move outward to become involved with objects, it naturally remains calm, peaceful, and radiant. As the saying goes: “Monks, the original Citta is naturally bright and clear, but it becomes defiled by passing mental defilements.” This original radiant Citta refers to the mind that continues wandering through birth and death in the cycle of rebirth. It can be compared to the mind of a newborn child whose mental abilities are not yet developed enough to fully understand sense objects. It does not refer to the completely pure Citta that has fully gone beyond rebirth.
As the Citta is investigated more deeply step by step, all the mental defilements that once moved around freely gather together into a single radiant center within the Citta. This radiance is extremely magnificent and captivating. At first, even the highest mindfulness and wisdom can become fascinated by it. It is an entirely new experience unlike anything encountered before. It appears extraordinary, majestic, and awe-inspiring, as though nothing could compare with it. And why should it not appear that way? For countless lifetimes, this radiance has ruled over the three worlds of existence like a supreme king. Since beginningless time, it has controlled the Citta completely. As long as the Citta lacks the mindfulness and wisdom needed to free itself, this radiance continues controlling it and causing rebirth in many different states of existence through the power of subtle defilements. In truth, it is this refined inner radiance that keeps living beings wandering endlessly through birth and death.
Once the Citta fully understands the body, feelings, memory, thought, and consciousness with complete certainty, only very subtle mental movements remain within the Citta. These appear as delicate forms of thought causing subtle activity inside the mind: subtle happiness, subtle suffering, and subtle inner radiance. That is all they are. At this stage, supreme mindfulness and wisdom focus entirely on these subtle inner movements, constantly observing and examining them.
The radiance created by the gathering together of mental defilements appears as a very refined point of brightness centered within the Citta. Occasionally, a subtle dullness arises and slightly clouds this radiance, causing a very subtle form of suffering to appear as well. In reality, brightness and dullness are simply two sides of the same conditioned reality. At this level, radiance, dullness, and subtle suffering always appear together.
Because of this, whenever the Citta experiences this wonderful radiance, it also feels slightly concerned that the experience might change or become disturbed at any moment. Mindfulness and wisdom work constantly to protect and preserve the radiance from becoming clouded. Yet no matter how subtle these disturbances are, they still belong to mental defilements. Therefore, meditators must never become complacent. Wisdom must continue examining these subtle changes in the Citta’s radiance with complete persistence.
To remove this subtle anxiety and completely resolve the issue, ask yourself: What exactly is this radiance? Focus carefully on it until you truly know. Why does it change? One moment it shines brightly; the next moment it becomes slightly dimmed. One moment there is subtle happiness; the next moment subtle suffering appears. One moment there is complete satisfaction; the next dissatisfaction quietly enters. Observe carefully this subtle happiness that still shows slight instability. Then notice the slightest appearance of suffering. At this refined level of mind, even the smallest irregularity becomes noticeable. Why does this subtle state of the Citta continue changing in different ways? It is not completely constant or reliable. Continue investigating fearlessly. Do not fear that destroying this radiance means destroying your true nature. Focus directly on this central point until you clearly see that the radiance possesses the same characteristics of impermanence, suffering, and non-self as every other phenomenon already investigated. The only difference is that this radiance is far more subtle and refined.
At this stage of investigation, nothing should be accepted blindly or trusted within the realm of conditioned reality. Bring your attention deeply into the Citta and allow wisdom to continue its work. Every false appearance originates within the Citta itself, and this radiance is the most obvious of them all. It is the ultimate illusion. Because you cherish and protect it more than anything else, you naturally hesitate to disturb it. Nothing in the physical body appears as extraordinary as this inner brightness. It creates such amazement and fascination that you instinctively want to preserve it. Yet this very radiance is actually fundamental ignorance itself, although you do not yet recognize it. Since you have never encountered it before, you naturally become deceived by it. Later, when mindfulness and wisdom become fully mature, the truth will reveal itself clearly without outside help. Then you will know: this is ignorance. True ignorance is nothing more than this mesmerizing point of brilliance. Do not imagine ignorance as some ugly demon or monster. In reality, it appears as the most beautiful and attractive thing in existence.
True ignorance is very different from what people normally imagine. Therefore, when meditators first encounter it, they fail to recognize it, and their practice becomes stuck there. Without a teacher to guide them and explain how to investigate further, they may remain trapped for a long time before understanding its true nature and moving beyond it. But with proper guidance, meditators can quickly understand the principle involved and investigate this radiant center directly without trusting it. This investigation must be carried out in exactly the same way as every other natural phenomenon.
After letting go of attachment to all five aggregates, the Citta becomes extremely refined. Although it has released everything else, it still has not released attachment to itself. The knowing nature of the Citta remains affected by the fundamental ignorance that does not yet understand its own true essence, and therefore it still clings to itself. At this point, all ignorance gathers into one central location within the Citta. Since all external attachments through the senses have already been cut off, ignorance has nowhere else to go and gathers inward instead. The eyes, ears, nose, tongue, and body once served as channels through which ignorance flowed outward toward sights, sounds, smells, tastes, and touch. Once mindfulness and wisdom permanently close these channels, ignorance loses all external outlets. Only a subtle inner vibration remains within the Citta itself. Since it no longer has outward activity, it relies completely on the Citta as its base. As long as wisdom has not fully transcended it, ignorance continues appearing as subtle happiness, subtle suffering, and overwhelming radiance. Therefore, the Citta continues focusing its investigation on these subtle experiences.
Every conditioned reality, no matter how refined, bright, or magnificent, always shows some slight instability. These tiny irregularities are enough to attract the attention of the Citta and encourage further investigation. The subtle happiness and suffering arising within the Citta, as well as the amazing radiance shining from it, all originate from ignorance. But because we have never experienced them before, we become deluded and attach to them during the early stages of investigation. We fall deeply under the spell of ignorance, believing these subtle feelings and radiant brightness to be our true self beyond all name and form. Unaware of the mistake, we accept this majestic state of Citta mixed with ignorance as our real identity.
But this misunderstanding does not last forever. At this level, supreme mindfulness and supreme wisdom never become careless. They constantly observe, examine, and analyze everything again and again. Eventually, truth becomes clear. They notice that the subtle feelings of happiness and suffering still show tiny changes that do not match the majestic radiance of the Citta. Even the smallest trace of suffering is enough to raise suspicion. Why does the Citta continue changing in these subtle ways? Why is it never completely stable? These tiny irregularities within the radiant center of the Citta create just enough movement to attract the careful attention of mindfulness and wisdom.
Once these irregularities are noticed, distrust naturally arises, warning wisdom that further investigation is needed. The knowing quality of the Citta itself now becomes the object of examination. Mindfulness and wisdom focus entirely on this point, trying to discover what this knowing truly is. Everything else has already been thoroughly investigated and abandoned step by step. Only this bright and amazing knowing presence remains. What exactly is it? As mindfulness and wisdom focus deeply on it, the entire Citta becomes the center of an intense investigation. It turns into a battlefield for supreme mindfulness and supreme wisdom. Before long, they completely destroy the ignorance hidden within the Citta that once appeared so glorious and magnificent. It is totally wiped away until not even the smallest trace remains.
When investigated with sharp and penetrating wisdom until fully understood, this final illusion suddenly breaks apart and disappears in a completely unexpected way. That moment of awakening can be described as complete enlightenment or the total destruction of the endless cycle of birth and death. At that moment, absolute certainty arises. When the radiant center disintegrates, something even more extraordinary—something long hidden by ignorance—is fully revealed. It feels as though a tremendous earthquake shakes the entire universe within the Citta. This moment, when the Citta breaks free from all conditioned reality, is beyond description in its wonder and magnificence. It is precisely here, when ignorance is finally extinguished, that the path of complete liberation becomes the fruition of complete liberation. The path reaches perfection, and full enlightenment is attained. Dhamma and the Citta become completely perfected. From that moment onward, all problems end. This is the true nature of Nibbāna.
When the condition once believed to be so magnificent finally breaks apart, something impossible to describe appears fully. That reality is Absolute Purity. Compared to this purity, the ignorance once treasured so highly is like cow dung compared to pure gold. Even a small child knows which is more valuable, so no further comparison is necessary.
The destruction of ignorance marks the final arrival of both the path and fruition of enlightenment. It is like climbing the stairs to a house: one foot remains on the final step while the other reaches the floor inside the house. We cannot yet say we have fully entered until both feet stand firmly inside. In the same way, the Citta fully reaches Dhamma only when it stands completely within the supreme reality of Nibbāna. From that moment onward, the Citta is entirely free. It no longer performs any activity aimed at removing defilements because nothing remains to remove. This is the fruition of full enlightenment, experienced only by those completely free from mental defilements while still alive.
As for the body, feelings, memory, thought, and consciousness, they are simply natural processes that arise and cease on their own without affecting or contaminating the Citta in any way. The same is true for sights, sounds, smells, tastes, and touch. Each exists according to its own separate nature. Their existence no longer creates any problem because the Citta is now free from the ignorance that once caused false assumptions about them. Fully knowing the truth, the Citta understands both its own knowing nature and the reality of all natural phenomena inside and outside itself. Since each thing now remains within its own separate reality, the conflicts that once existed between them disappear completely. All things simply follow their own nature. At this stage, the long struggle between mental defilements and the Citta finally comes to an end.
When truth is known in this way, the Citta no longer feels fear or concern regarding the life and death of the body and mind. The Citta simply observes how natural processes arise, interact, and disappear, and how the body eventually breaks apart at death. But because the essential knowing nature of the Citta never dies, fear of death no longer exists. One accepts death when it comes, and accepts life while it continues. Both are simply different aspects of the same truth.
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