Some minds seem to have no chief end of life. Their existence is a succession of small purposes, each of which has its turn in controlling the life. Others have a strong, defined, and all-controlling principle. Now experience shows that both of these classes are capable, the one of _forming_ and the other of _changing_ such a purpose. For example, in a time of peace and ease there is little to excite the mind strongly; but let a crisis come where fortune, reputation, and life are at stake, and men and women are obliged to form generic decisions involving all they hold dear, and many minds that have no controlling purpose immediately originate one, while those whose former ruling aims were in one direction change them entirely to another. This shows how it is that days of peril create heroes, statesmen, and strong men and women. The hour of danger calls all the energies of the soul into action. Great purposes are formed with the strongest desire and emotion. Instantly the whole current of thought, and all the co-existing desires and emotions, are conformed to these purposes. The experience of mankind proves that a dominant generic purpose may _extend to a whole life_, and actually control all other generic and specific volitions. _Mode of Controlling the Intellect, Desires, and Emotions._ We will now consider some of the modes by which the will controls the intellect, desires, and emotions. We have seen, in previous pages, the influence which desire and emotion exert in making both our perceptions and conceptions more vivid. Whatever purpose or aim in life becomes an object of strong desire, is always distinctly and vividly conceived, while all less interesting objects are more faint and indistinct. We have also seen that whenever any conception arises it always brings connected objects, according to certain laws of association, forming a new and complex picture. Whenever the mind is under the influence of a controlling purpose, the object of pursuit is always _more interesting_ than any other. This interest always fastens on those particulars in any mental combination that are connected with the ruling purpose and seem fitted to promote it, making them more vivid. Around these selected objects their past associated ideas begin to cluster, forming other complex pictures. In all these combinations, those ideas most consonant with the leading interest of the mind become most vivid, and the others fade away. The grand method, then, for _regulating the thoughts_ is by the generic decisions of the mind as to the modes of seeking enjoyment. In regard to the power of the mind over its own desires and emotions, it is very clear that these sensibilities can not be regulated by direct specific volitions. Let any person try to produce love, fear, joy, hope, or gratitude by simply choosing to have them arise, and it is soon perceived that no such power exists.