What can be shown, cannot be said.

Nothing is more important for teaching us to understand the concepts we have than to construct fictitious ones.

Words are probes. Some reach very deep, some only to a little depth.

The solution to the problem of life is seen in the vanishing of this problem.

What signs fail to express, their application shows. What signs slur over, their application says clearly.

The philosophical I is not the human being, not the human body or the human soul with the psychological properties, but the metaphysical subject, the boundary (not a part) of the world.

My day passes between logic, whistling, going for walks, and being depressed. I wish to God that I were more intelligent and everything would finally become clear to me - or else that I needn't live much longer.