J. Abelson 
The Wisdom of the Kabbalah 

The mystic differs from the ordinary religionist in that whereas the latter knows God through an objective revelation whether in nature or as embodied in the Bible (which is really only second-hand knowledge, mediate, external, the record of other people's visions and experiences), the mystic knows God by contact of spirit with spirit; cor ad cor loquitur. He has the immediate vision; he hears the still small voice speaking clearly to him in the silence of his soul. In this sense the mystic stands quite outside the field of all the great religions of the world. Religion for him is merely his own individual religion, his own lonely, isolated quest for truth. He is solitary, a soul alone with God.