Tripura Rahasya

Sage Dattatreya said,

Hemalekha continued,

They understand the universe in space but have no regard for space itself. Similarly, it is with them in regard to the Self. My Lord, consider well. The world consists of knowledge and the objects known. Of these the objects are non-self and perceived by senses; knowledge is self-evident; there is no world in the absence of knowledge. Knowledge is the direct proof of the existence of objects which are therefore dependent on knowledge. Knowledge is dependent on the knower for its existence. The knower does not require any tests for knowing his own existence. The knower therefore is the only reality behind knowledge and objects. That which is self-evident without the necessity to be proved, is alone real; not so other things.