Emotions, on the other hand, serve to sustain, and, in their less violent form, to facilitate action. It has already been noted that the organic disturbances which are so conspicuous a feature of emotion are extremely important in preparing the body for the overt actions in which these emotions always tend to issue. And it is unquestionable that emotions, though in more or less obscure ways, call up reserves of energy in the service of the activity in connection with which the emotion has been aroused. While very violent emotions, as in the case of extreme anger or fear or pity, confuse, disorganize, and even paralyze action, in more moderate form they rather serve to stimulate and reinforce it. Emotions are, in many cases, merely the inner or subjective awareness of one of these great driving forces, or a complex of them. Anger, pity, and fear, in their less extreme forms, pour floods of energy into the activities in which they take overt expression. It needs no special knowledge to recognize the fact that the normal interests and enterprises of life are quickened and sustained when some great emotional drive can be roused in their support. Ambition, loyalty, love, or hate may stir men to and sustain them in long and difficult enterprises which they would neither undertake nor continue were these motive forces removed. The soldier does not fight persistently and well wholly, or often even in part, because he has thought out the situation and found the cause of his country to be just. He is stirred and sustained by the energies which the emotional complex called "patriotism" has roused and concentrated toward action. A scientist performing long and difficult researches, a father sacrificing rest and comfort that his children may be well provided for, a boy working to pay his way through college, are all persisting in courses of action, because of the driving power which the emotions, more or less mixed, of curiosity, or tenderness, or self-assertion have released.