Here we touch the third character of effective suggestion: _Feeling_. When the idea is charged with emotion, it is far more likely to be realized. War neuroses have taught us the dreadful potency of the emotional stimulus of fear; but this power of feeling over the unconscious has its good side too. Here we find psychology justifying the often criticized emotional element of religion. Its function is to increase the energy of the idea. The cool, judicious type of belief will never possess the life-changing power of a more fervid, though perhaps less rational faith. Thus the state of corporate suggestibility generated in a revival and on which the success of that revival depends, is closely related to the emotional character of the appeal which is made. And, on higher levels, we see that the transfigured lives and heroic energies of the great figures of Christian history all represent the realization of an idea of which the heart was an impassioned love of God, subduing to its purposes all the impulses and powers of the inner man, "If you would truly know how these things come to pass," said St. Bonaventura, "ask it of desire not of intellect; of the ardours of prayer, not of the teaching of the schools."[112] More and more psychology tends to endorse the truth of these words. Quiescence, attention, and emotional interest are then the conditions of successful suggestion. We have further to notice two characteristics which have been described by the Nancy school of psychologists; and which are of some importance for those who wish to understand the mechanism of religious experience. These have been called the law of Unconscious Teleology, and the law of Reversed Effort.