When mind and prana are absorbed by the object of meditation, the light arises. The absolute in the form of a radiating light which is the source of all things is the highest objective to be reached. There is no higher state that a Yogi can expect. Direct your inner gaze upon this light and cross the ocean of existence.
Hatha Yoga Pradipika: IV - 37 to 41 ~ 14th Century, CE • adapted by Pankaj Seth