The engine

An arrow in flight is easy to picture. The residue of a deed is not. When you tell a lie, or forgive an enemy, the act is over in a moment; the sound dies, the muscles relax, the world moves on. And yet the tradition insists that something remains, stored, waiting, real enough to shape a life not yet begun. What is that something, and where does it sit?

The answer is one of the most psychologically acute pieces of the whole system, and it long predates any modern account of how habits form.

The imprint

Every action, the tradition holds, leaves a trace in the mind. The word is samskara: an impression, a groove, a subtle mark scored into the deep layers of consciousness by the act of doing.

A single samskara is faint. But actions repeat, and the imprints stack. Tell the truth a hundred times and truthfulness cuts a channel; the hundred-and-first truth runs more easily than the first. Yield to anger again and again and the groove deepens until anger becomes the path of least resistance, arriving before you have decided anything. When enough imprints of a kind have accumulated, they harden into a standing tendency. That hardened tendency is a vasana: a latent disposition, a drive that leans the whole person in a direction before any particular choice is made.

Patanjali builds his account of karma on exactly this pair. In the fourth chapter of the Yoga Sutras, at 4.8 and after, he describes how the deposit of action gives rise, when the conditions are right, to the vasanas that match it, and how memory and imprint feed one another in a chain that reaches back beyond the present life. The commentator Vyasa draws out the image the tradition would keep: the mind as a field, sown with the seeds of past action, sprouting the tendencies of the present when season and soil allow.

The loop that will not stop on its own

Put the pieces in motion and you have an engine that runs itself.

A vasana is not passive. A standing tendency toward, say, acquisition does not sit quietly; it generates desire, the active wanting of this object now. Desire moves the person to act. The act, performed, lays down a fresh samskara of acquisition, which thickens the vasana, which breeds the next desire, which drives the next act. Round it goes. Imprint to tendency to desire to action to imprint. This is the machinery under the granary of the last chapter: the store of karma is not an inert pile but a living, self-renewing system, forever sowing the conditions of its own continuation.

The philosopher Surendranath Dasgupta, tracing this through the Yoga literature, saw in it the tradition’s real theory of bondage. We are bound less by any single deed than by the momentum of our own accumulated tendencies, which keep manufacturing the desires that keep manufacturing the deeds. The wheel of rebirth, on this reading, is turned from inside. No external jailer is required. The vasanas do the work.

This is also why the tradition treats liberation as so difficult and takes discipline so seriously. You cannot simply decide to stop. The tendencies decide before you do, and they were laid down over a span the mind cannot even remember. To change the output you have to reach the groove, and reaching the groove is the whole labour of the practices the site treats elsewhere, from the restraint of the mind in yoga to the reorientation of desire in devotion.

Where the debt hides

There is a reason this chapter sits where it does, just before the treatise turns to what carries karma across death, and just before, in its fourth movement, it reaches the debts between souls.

The vasana is where those debts are stored. When the tradition says that specific people are drawn back into your life to settle old accounts, the mechanism it is reaching for is this one. An intense bond in one life, of love or of injury, of gratitude or of grievance, cuts a deep groove. The imprint of that person, the pull toward them or the recoil from them, becomes a vasana that leans across the boundary of death. It is the residual attraction and aversion of the vasanas, the tradition holds, that draws the same souls together again, and again, until the charge in the groove is finally spent. This treatise’s thirteenth chapter, on runanubandha, the debt-bond, will build directly on the engine described here. The debt is not filed in a cosmic office. It is scored into the deep mind, as a groove worn by the deed and the desire that once bound two people together.

Hold the finding, because it makes the later claim intelligible rather than magical. A relationship carried across lifetimes is a vasana carried across lifetimes. The bond is a groove.

What the engine still cannot explain

The engine tells us how a deed becomes a disposition, and how the disposition renews itself. It does not yet tell us how any of this survives the one event that ends the body and scatters the senses. A groove is worn in the mind. But the mind, as we ordinarily know it, seems to depend on the brain, and the brain burns on the pyre. If the imprints are to reach a next life at all, something has to carry them across the gap. Something has to survive the fire.

The tradition has an answer, and it is more specific than most readers expect. There is a vehicle. There is even a map of the road it travels.

The next chapter follows both.