 Intuition is a form of direct, immediate insight. Intuition has been likened to (a sort of internal) perception by most rationalists and empiricists alike. Intellectually grasping a proposition, we just “see” it to be true in such a way as to form a true, warranted belief in it. (As discussed in Section 2 below, the nature of this intellectual “seeing” needs explanation.) Deduction is a process in which we derive conclusions from intuited premises through valid arguments, ones in which the conclusion must be true if the premises are true. We intuit, for example, that the number three is prime and that it is greater than two. We then deduce from this knowledge that there is a prime number greater than two. Intuition and deduction thus provide us with knowledge that is independent, for its justification, of experience. This type of knowledge, since Kant, is commonly called “a priori”.