The body is the only part of the world that is both felt from within and - so far as it surface goes - at the same time perceived.

Some exact experiment in biological research may often make us feel that we have grasped life in its original wholeness and that we have at last penetrated it through and through and yet in the end we find it is still only a widening of mechanistic insight, a widening which in comparison with the preceding simplicites may be truly magnificient but which is yet no penetration of life itself, only of its apparatus.

We always need to distinguish what the experiment really shows from the theoretical explanations we give of what is happening.

Clothes and furniture help us to deduce a man's character.

The drive for food has something in common with the drive to destroy because it destroys what is eaten.