Three Elements of Reason

Firstly, there is the reception of the facts to reason about. These facts are received either from our own senses, or from the report of other minds; that is, either experience or authority supplies us with our material…
Secondly, there is the direct, simple act of the mind perceiving self-evident truth, as when we see that if A and B both equal C, then they are equal to each other. This act I call Intuition.
Thirdly, there is an art or skill of arranging the facts so as to yield a series of such intuitions which linked together produce a proof of the truth or falsehood of the propositions we are considering.

C.S. Lewis

Kinds of Truth

“There was, of course, something one-sided in all this. [The Priority of imagination over reason.] I was oblivious of every aspect of truth except that which appealed to me. But at the same time I grasped a truth of great importance. I had realized the danger of abstract thought when it loses touch with the concrete realities of life, and I had discovered the truth of experience, which is mediated through the imagination, and which often gives a deeper insight into reality than abstract thought.”

Bede Griffiths