X. The Idea of Freedom

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 Kreyenbuhl ( 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. Kreyenbuhl 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.