Utpaladeva, writing in Kashmir in the tenth century, built the recognition doctrine around a deceptively simple analogy: recognizing an old friend in a crowd, or recognizing a familiar face one has somehow forgotten, requires no new information, only the removal of an obstruction to seeing what was true all along. His Ishvara-pratyabhijna-karika argues that the individual self, ordinarily experienced as limited, bound and separate, is in reality identical with Shiva, the single universal consciousness whose nature is to know, will and act freely, and that spiritual practice is therefore a matter of recognizing this identity rather than achieving union with something previously separate.
The doctrine is closely tied to the concept of spanda, the subtle vibration or pulsation held to be consciousness's own creative activity, through which the one undivided Shiva appears to become the many finite selves and objects of ordinary experience without ever actually ceasing to be one; recognizing oneself as Shiva is, on this account, recognizing that the vibration one calls one's own mind was never really distinct from the universal vibration in the first place. The approach marks a deliberate contrast with paths of effort, in which liberation is treated as a goal to be reached through gradual practice and purification over time.