They would experience cessation of suffering through direct perception of impermanence, non-self, and unsatisfactoriness in all phenomena.
The Three Marks of Existence—impermanence (anicca), non-self (anatta), and unsatisfactoriness or suffering (dukkha)—are not beliefs to adopt but realities to directly perceive. In the Pali Canon, the Buddha repeatedly emphasizes that genuine understanding comes through direct experience, not intellectual assent. When someone truly internalizes these marks, they see them operating in every moment of experience: sensations arising and passing, thoughts appearing without a permanent thinker behind them, and the persistent dissatisfaction inherent in clinging to anything impermanent.
This internalization is not a one-time event but progressive insight deepening through meditation practice and reflection. The Dhammapada and various Sutta Nipata texts describe the person who has genuinely seen these marks as fundamentally transformed in their relationship to existence itself.
Someone who genuinely internalizes the Three Marks undergoes a radical reorientation of consciousness. The constant underlying anxiety produced by denying impermanence—trying to make the temporary permanent—begins to dissolve. Instead of fighting reality, the person aligns with it. This brings immediate relief and clarity. The mental energy previously devoted to denial, bargaining, and resistance becomes available for wisdom and compassion.
According to the Visuddhimagga (The Path of Purification), a 5th-century Theravada text by Buddhagosa, insight into the Three Marks progressively weakens the mental defilements, particularly greed, hatred, and delusion. The person experiences greater equanimity because they stop expecting permanence. They also experience reduced fear because they recognize that the "self" they were protecting doesn't exist as they imagined it.
Deep internalization of the Three Marks directly undermines the root cause of suffering: craving (tanha). If you genuinely perceive that everything is impermanent and that there is no unchanging self to acquire things for, the fundamental drive to grasp, cling, and accumulate loses its force. This doesn't mean becoming passive; it means acting without the anxious, desperate quality that characterizes ordinary motivation.
The Samyutta Nikaya presents this as the essential mechanism of liberation. Craving cannot survive genuine, embodied understanding that its objects are unstable and that there is no lasting "I" to benefit from possession. This creates what the Pali Canon calls "dispassion" (viraga)—not cold rejection but natural cooling of compulsive desire. The person still engages with life, but the frantic quality is gone.
In Theravada Buddhism, progressive insight into the Three Marks marks the stages of awakening. The Mahasatipatthana Sutta describes how insight into impermanence, non-self, and dukkha in body, feelings, mind, and mental phenomena leads to the fruition of Nirvana. Someone genuinely internalizing these marks would be actively progressing through the four stages (stream-entry, once-returner, non-returner, and arhat), each involving deeper penetration of these truths.
Mahayana traditions similarly emphasize insight into impermanence and emptiness (sunyata, which encompasses both non-self and the lack of inherent existence) as central to the path. The Lankavatara Sutra and Heart Sutra both point to this insight as the gateway to liberation, though they emphasize the emptiness of all phenomena more explicitly than the earliest Pali texts.
Ultimately, genuine internalization of the Three Marks leads directly toward Nirvana—the cessation of suffering and the end of the cycle of rebirth (samsara). This is not escape to another realm but the extinction of the conditions that perpetuate suffering: craving, aversion, and ignorance. The person experiences increasing peace, clarity, and freedom from the exhausting work of maintaining a false sense of permanent self.
All Buddhist schools agree that this path requires not just intellectual understanding but lived, moment-to-moment seeing. The Dhammapada states: "Those who have seen the Dhamma [the truth of the Three Marks] are released from birth and death." The timeline varies depending on individual capacity and effort, but the direction is unmistakable: toward liberation.