The detailed psychological analysis of cases of conscience and the study of its genesis are of no essential ethical interest, except as they show us that the sense of duty is not an ultimate, irreducible element in our consciousness, or make clearer to us its function and value. Conscience is the general name for coercion upon conduct from within the mind. The important thing to note is the useful purpose, which, in its so widely varying forms, it serves. Whatever its sources or its exact nature in contemporary man, it is one of the most valuable of our assets. To a more explicit statement of its value we must now turn. What is the value of conscience? It would seem, at first glance, as if the development of reason should make conscience unnecessary. When we are able to discern the consequences of our acts, formulate and weigh our motives and aims, what need of these vague pre-rational promptings and inhibitions? Why not train men to supplant a blind sense of duty by a conscious insight, a rational valuation of ends and means? Is not reason, as it has been recently called, "the ultimate conscience"? [Footnote: G. Santayana, Reason in Science, p. 232; where also the following: "So soon as conscience summons its own dicta for revision in the light of experience and of universal sympathy, it is no longer called conscience, but reason."] (1) Conscience is valuable on account of our ignorance. Individually we have not had experience enough to guide us in our crises; conscience is the representative in us of the wisdom of the race. In many cases we should never reason out the right solution of a problem; we lack the data. But we can lean upon the racial experience. Many past experiences, now forgotten, have gone to the molding of this faculty. The need of action is often imminent, there is no time for the long study of the situation which alone could form a sure insight into the conduct it demands. We need readymade morals. Moreover, we are subject to bias, to individual one sidedness, and to the distortion of passion; in the stress of temptation we are not in a mood to reason judicially, even if we have the necessary data. Altogether, insight, though in the long run the critic of conscience, is not a practical substitute. What conscience tells us is more apt to be true than what at the moment seems a rational judgment.