You know things in a flash. Professor Bergson preached about intuition in France to make the people understand that there was a higher source of knowledge than the intellect. In intuition there is no reasoning process at all. It is direct perception. Intuition transcends reason but does not contradict it.
Intellect takes a man to the door of intuition and returns.
Spiritual flashes and glimpses of truth, inspiration, revelation and spiritual insight come through intuition. The mind has to be pure for one to know that it is the intuition that is functioning at a particular moment. It transcends the causal body and is the highest form of knowledge. It is the only Reality.