Faith or beliefs are guesses that a person freely and voluntarily chooses to think are true. A true belief is always held without evidence. If evidence exists, or is available, then a true belief cannot exist. The nature of belief is such that all beliefs are infallible, but this does not imply unchanging or eternal. Beliefs can be changed at will.
Delusions are a serious error in thinking, but true beliefs have a high truth-value.
Experience or observations are things or events that are sensed, either directly by a human body or with the aid of mechanical sensory devices, such as telescopes or microscopes, or eyeglasses or hearing aids. It is normally the best source of knowledge available to a human being. Unfortunately in the English language, reason also often means the much less truthful and more error prone process of deductive thinking, as well as other methods of guessing. Intuition or insight is the direct perception of reality without the use of the senses. I suspect, and this is only a suspicion at this point, that the scientific explanation of intuition is that the brain is detecting quantum fluctuations in the fabric of spacetime itself.