Moral imagination, in order to realise its ideas, must enter into a determinate sphere of percepts. Human action does not create percepts, but transforms already existing percepts and gives them a new character. In order to be able to transform a definite object of perception, or a sum of such objects, in accordance with a moral idea, it is necessary to understand the object's law (its mode of action which one intends to transform, or to which one wants to give a new direction). Further, it is necessary to discover the procedure by which it is possible to change the given law into the new one. This part of effective moral activity depends on knowledge of the particular world of phenomena with which one has got to deal. We shall, therefore, find it in some branch of scientific knowledge. Moral action, then, presupposes, in addition to the faculty of moral concepts [8] and of moral imagination, the ability to alter the world of percepts without violating the natural laws by which they are connected. This ability is moral technique. It may be learnt in the same sense in which science in general may be learnt. For, in general, men are better able to find concepts for the world as it is, than productively to originate out of their imaginations future, and as yet non-existing, actions. Hence, it is very well possible for men without moral imagination to receive moral ideas from others, and to embody these skilfully in the actual world. Vice versa, it may happen that men with moral imagination lack technical skill, and are dependent on the service of other men for the realisation of their ideas. In so far as we require for moral action knowledge of the objects upon which we are about to act, our action depends upon such knowledge. What we need to know here are the laws of nature. These belong to the Natural Sciences, not to Ethics. Moral imagination and the faculty of moral concepts can become objects of theory only after they have first been employed by the individual. But, thus regarded, they no longer regulate life, but have already regulated it. They must now be treated as efficient causes, like all other causes (they are purposes only for the subject). The study of them is, as it were, the Natural Science of moral ideas. Ethics as a Normative Science, over and above this science, is impossible.