mys·ti·cism
1. The belief that personal communication or union with the divine is achieved through intuition, ecstasy, or sudden insight rather than rational thought.
2. Immediate consciousness of the transcendent or ultimate reality or God.
3. The experience of such communion as described by mystics.
4. A belief in the existence of realities beyond perceptual or intellectual apprehension that are central to being and directly accessible by subjective experience.
"There are indeed fundamentally two categories of knowledge -- Knowledge by Ideation and Knowledge by Being. All scientific knowledge, whether physical or super-physical, belongs to the first category. Such knowledge is based on the duality of the observer and observed. In spiritual perception, however, there is Knowledge by Being -- it arises in that state where the duality of the observer and the observed has vanished. This is the very core of direct or what is otherwise called the Mystical experience."
-Unknown
The Buddha (or any other modern day mystics will do)