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.

In order to draw a limit to thinking, we should have to think both sides of this limit.

It is much easier to bury a problem than to solve it.

It would strike me as ridiculous to want to doubt the existence of Napoleon; but if someone doubted the existence of the earth 150years ago, perhaps I should be more willing to listen, for now he is doubting our whole system of evidence.

Most of the propositions and questions to be found in philosophical works are not false but nonsensical.

It is an hypothesis that the sun will rise tomorrow: and this means that we do not know whether it will rise.

The classifications made by philosophers and psychologists are like trying to classify clouds by their shape.