Animals cannot stand the human way of life. Even as regards nourishment, they have a certain security. If a cow goes over a meadow, she knows exactly what plants are good for her. Man has that no more. He needs insecurity in order to come to freedom of choice. The present insecurity is necessary to reach security at a higher stage. Man adapts himself to higher stages. Thus his becoming insecure is the guarantee that he becomes independent. To have remained secure denotes something that has not advanced to the point where the ego can work in the individual being.
Source: Rudolf Steiner – GA 97 – The Animal Soul – Leipzig, 16th March, 1907
Translated by Anna R. Meuss