Yoga Sutras of Patanjali translated by Yogi Kalinath Aghori - Chapter 4, verse 17
Pada 4, Sutra 17
Tad-uparaagaapeksitvaac cittasya vastu jnaataajnaatam
An object is known or unknown dependent on the conditionality of the consciousness.
The mind can only know an object when it is aware of it otherwise it remains unknown.
The object becomes colored according to the conditionality of the consciousness that perceives it.
An object can only be known as it truly is when the mind that perceives it drops all conditionality and expectation.
More often than not we see the world as we are and not as it truly is.