The highest level of individual life is that of conceptual thought without reference to any definite perceptual content. We determine the content of a concept through pure intuition on the basis of an ideal system. Such a concept contains, at first, no reference to any definite percepts. When an act of will comes about under the influence of a concept which refers to a percept, i.e., under the influence of an idea, then it is the percept which determines our action indirectly by way of the concept. But when we act under the influence of pure intuitions, the spring of our action is pure thought. As it is the custom in philosophy to call pure thought "reason," we may perhaps be justified in giving the name of practical reason to the spring of action characteristic of this level of life. The clearest account of this spring of action has been given by Kreyenbühl (Philosophische Monatshefte, vol. xviii, No. 3). In my opinion his article on this subject is one of the most important contributions to present-day philosophy, more especially to Ethics. Kreyenbühl calls the spring of action, of which we are treating, the practical a priori i.e., a spring of action issuing immediately from my intuition. It is clear that such a spring of action can no longer be counted in the strictest sense as part of the characterological disposition. For what is here effective in me as a spring of action is no longer something purely individual, but the ideal, and hence universal, content of my intuition. As soon as I regard this content as the valid basis and starting-point of an action, I pass over into willing, irrespective of whether the concept was already in my mind beforehand, or whether it only occurs to me immediately before the action, that is, irrespective of whether it was present in the form of a disposition in me or not. A real act of will results only when a present impulse to action, in the form of a concept or idea, acts on the characterological disposition. Such an impulse thereupon becomes the motive of the will. The motives of moral conduct are ideas and concepts. There are Moralists who see in feeling also a motive of morality; they assert, e.g., that the end of moral conduct is to secure the greatest possible quantity of pleasure for the agent. Pleasure itself, however, can never be a motive; at best only the idea of pleasure can act as motive. The idea of a future pleasure, but not the feeling itself, can act on my characterological disposition. For the feeling does not yet exist in the moment of action; on the contrary, it has first to be produced by the action.