_Renewal of Hope._--How much energy even the slightest hope may furnish, when apparently all power of effort is exhausted, is well illustrated by what happens to men who are lost at sea or in a desert. After the lapse of a certain length of time human nature seems utterly incapable of further effort and they sink down exhausted. The appearance of a light at a distance, a hail, any communication that gives them even the slightest hope will renew their energy and enable them to draw on unsuspected stores of vitality after the end seemed inevitable. It may be said that the exhaustion in these cases is more apparent than real, that discouragement prevents the release of even the energy that is present, and might be used under more favorable circumstances, but that is exactly the argument which favors the deliberate employment of psychotherapeutic motives to enable patients to use the energies which they possess. In the midst of disease, or the struggle for life, when vitality is {92} being sapped, hope is lost or obscured, just as it is when a man is alone in the desert or struggling far from help on the ocean. If we can prevent this discouragement from sapping his powers there will always be a prolongation of life, and often this will be sufficient to enable vital resistance to overcome exhausting disease. Law of Reserve Energy.--Prof. William James [Footnote 13] called particular attention to the law of reserve energy which recent studies in psychology have emphasized. This law of reserve energy is a conclusion from certain facts which are very familiar to men and have been observed as long as the memory of man runs, yet the full significance of which has never been read quite aright. Applied to a very limited range of actions, it has been applied only half-heartedly in ordinary life, and to its full extent only under the pressure of absolute necessity. This law holds out the best promise to psychotherapy. It shows that there are reservoirs of surplus energy in man which, if they can be successfully tapped, present possibilities of resistance to fatigue--and fatigue in many more ways than we used to think resembles disease. Besides, this law represents a very wonderful capacity for withstanding pains and aches and conquering disinclination that would otherwise seem impossible. If it can be made to apply to ordinary life as well as it does to extraordinary events, then the conscious deliberate use of psychotherapy or mental suggestion should prove to have wonderful remedial power. Prof. James said: [Footnote 13: _American Magazine_, Sept., 1908.]