This comes from my morning reading:
the human spirit is unable to compel the divine Spirit to enter the human spirit. The attempt to do so belongs directly to the ambiguities of religion and indirectly to the ambiguities of culture and morality. If religious devotion, moral obedience, or scientific honesty could compel the divine Spirit to “descend” to us, the Spirit which “descended” would be the human spirit in a religious disguise. It would be, and often is, simply man’s spirit ascending, the natural form of man’s self-transcendence. The finite cannot force the infinite; man cannot compel God. The human spirit as a dimension of life is ambiguous, as all life is, whereas the divine Spirit creates unambiguous life
–Paul Tillich, Systematic Theology (1964), 3.119-20
Peripatetic Learning 