Momentariness

Momentariness (Sanskrit kṣaṇikavāda, "the doctrine that things last only an instant") is the idea that conditioned things — anything produced by causes — do not endure through time but exist only for a single fleeting moment, arising and perishing instant by instant. What looks like one continuous object, like a candle flame or a flowing river, is really a rapid succession of brand-new momentary events, each replaced before you notice. The chair you sat on a second ago is, strictly speaking, not the same chair now; it is the latest in a near-instant series.

The doctrine grew out of the Abhidharma, the analytical systematizing of the Buddha's teaching that developed in several early schools from around the 2nd century BCE. It is a sharpened version of the basic Buddhist observation of impermanence — that all conditioned things change — pushed to its logical edge: change is not gradual aging but a constant flicker of replacement. Applied to a person, it dissolves the illusion of a solid, lasting self: there is just a stream of momentary mind-and-body events, none of them a fixed "you." (This is not the claim that you don't exist at all — only that no unchanging core lasts beneath the flow.)

This was a genuinely contested teaching. It raised hard puzzles the schools argued over for centuries: if everything is gone in an instant, how can one moment cause the next, how do memory or moral responsibility carry across moments, and how does anything change if it never lasts long enough to do so? Different schools answered differently, making momentariness less a settled fact than a productive battleground in Buddhist thought.