Consciousness gains knowledge through experience, by means of its five physical and psychological actions: exertion, movement, observation, feeling and memorization.
What does consciousness gain knowledge about?
It gains knowledge about its physical and psychological movements and actions since there is nothing else that knowledge can be gained about.
How is knowledge used and what purpose does it serve?
Knowledge is used by the two remaining psychological actions of thinking and understanding. It serves consciousness to transform itself into the state of its desire (will), then to exert itself, move, act, and acquire knowledge. All this bearing in mind the fact known to us from our own experience that it is not possible to either desire or to do what one does not know about. And bearing in mind the scientific fact which states that movement of matter is self-movement. This implies that the driving force of all things and phenomena from which the universe is made is always an internal subjective thing of those very things and phenomena that are moving.