The problem of knowing man is parallel to the religious problem of knowing God. In conventional Western theology the attempt is made to know God by thought, to make statements about God. It is assumed that I can know God in my thought. In mysticism, which is the consequent outcome of monotheism, the attempt is given up to know God by thought, and it is replaced by the experience of union with God in which there is no more room—and no need—for knowledge about God.
Erich Fromm, The Art of Loving
philosophy, psychology