What distinguishes man from all other organic beings is his rational thought. Activity is common to him with other organisms. Nothing is gained by seeking analogies in the animal world to clear up the concept of freedom as applied to the actions of human beings. Modern science loves these analogies. When scientists have succeeded in finding among animals something similar to human behaviour, they believe they have touched on the most important question of the science of man. To what misunderstandings this view leads is seen, for example, in the book Die Illusion der Willensfreiheit, by P. Ree, 1885, where, on Page 5, the following remark on freedom appears: "It is easy to explain why the movement of a stone seems to us necessary, while the volition of a donkey does not. The causes which set the stone in motion are external and visible, while the causes which determine the donkey's volition are internal and invisible. Between us and the place of their activity there is the skull cap of the ass.... The causal nexus is not visible and is therefore thought to be non-existent. The volition, it is explained, is, indeed, the cause of the donkey's turning round, but is itself unconditioned; it is an absolute beginning." Here again human actions in which there is a consciousness of the motives are simply ignored, for Ree declares, "that between us and the sphere of their activity there is the skull cap of the ass." As these words show, it has not so much as dawned on Ree that there are actions, not indeed of the ass, but of human beings, in which the motive, become conscious, lies between us and the action. Ree demonstrates his blindness once again a few pages further on, when he says, "We do not perceive the causes by which our will is determined, hence we think it is not causally determined at all." But enough of examples which prove that many argue against freedom without knowing in the least what freedom is. That an action of which the agent does not know why he performs it, cannot be free goes without saying. But what of the freedom of an action about the motives of which we reflect? This leads us to the question of the origin and meaning of thought. For without the recognition of the activity of mind which is called thought, it is impossible to understand what is meant either by knowledge of something or by action. When we know what thought in general means, it will be easier to see clearly the role which thought plays in human action. As Hegel rightly says, "It is thought which turns the soul, common to us and animals, into spirit." Hence it is thought which we may expect to give to human action its characteristic stamp.