true for one is true for all. Each man is a member of a rational order, and possesses the inalienable independence and the moral dignity of being an end in himself. Hence the formula of all duty is, 'Act from a maxim at all times fit to be a universal law.' It is the merit of Kant that he has given clear expression to the majesty of the moral law. No thinker has more strongly asserted man's spiritual nature or done more to free the ideal of duty from all individual narrowness and selfish interest. But Kant's principle of duty labours under the defect, that while it determines the form, it tells us nothing of the content of duty. We learn from him the grandeur of the moral law, but not its essence or motive-power. He does not clearly explain what it is in the inner nature of man that gives to obligation its universal validity or even its dominating force. As a recent writer truly says, 'In order that morality may be possible at all, its law must be realised _in_ me, but while the way in which it is realised is mine, the content is not mine; otherwise the whole conception of obligation is destroyed.'[13] If the soul's function is purely formal how can we attain to a self-contained life? Moreover, if the freedom which Kant assigns to man is really to achieve a higher ideal and bring forth a new world, must there not be some spiritual power or energy, some dynamic force, which, while it is within man, is also without, and independent of, him? 'Duty for duty's sake' lacks lifting power, and is the essence of legalism. Love, after all, is the fulfilling of the law.