"The spark within is akin to the Divine Ground. By identifying ourselves with the first we can come to unitive knowledge of the second. These empirical facts of the spiritual life have been variously rationalized in terms of the theologies of the various religions. The Hindus categorically affirm that Thou art That — that the indwelling Atman is the same as Brahman. For orthodox Christianity there is not an identity between the spark and God. Union of the human spirit with God takes place — union so complete that the word deification is applied to it; but it is not the union of identical substances. According to Christian theology, the saint is “deified,” not because Atman is Brahman, but because God has assimilated the purified human spirit in to the divine substance by an act of grace. Islamic theology seems to make a similar distinction. The Sufi, Mansur, was executed for giving to the words “union” and “deification” the literal meaning which they bear in the Hindu tradition. For our present purposes, however, the significant fact is that these words are actually used by Christians and Mohammedans to describe the empirical facts of metaphysical realization by means of direct, super-rational intuition."