A main cause of philosophical disease-an unbalanced diet: one nourishes one's thinking with only one kind of example.

Believers who have formulated such proofs [for God's existence] ... would never have come to believe as a result of such proofs

Is my understanding only blindness to my own lack of understanding? It often seems so to me.

Philosophy is not a theory but an activity.

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

We feel that even if all possible scientific questions be answered, the problems of life have still not been touched at all.

If a lion could talk, we could not understand him.