Shuddha-vidya

Shuddha vidya – exists when the yogi realizes his own nature and yet that realization is not stable. It is flickering and moving. “Sometimes you realize it, sometimes you forget it.”

This shuddha vidya state consists of an entirely subjective impression, meaning you are the ‘subject’ and not the objects, the objective external. “I am Shiva, this universe is in duality. This universe is unreal, I am Shiva (the Oneness, God consciousness).” But we cannot hold on to this awareness in continuity. It flickers and fluctuates.

Source

http://www.inannareturns.com/articles/shivasutras/sutra003-34-37.htm