The world of those who are happy is different from the world of those who are not.

What Copernicus really achieved was not the discovery of a true theory but of a fertile new point of view.

Philosophy is not a body of doctrine but an activity. ...Without philosophy thoughts are, as it were, cloudy and indistinct: its task is to make them clear and to give them sharp boundaries.

I don't know why we are here, but I'm pretty sure that it is not in order to enjoy ourselves.

The subject does not belong to the world; rather, it is a limit of the world.

Philosophers are often like little children, who first scribble random lines on a piece of paper with their pencils, and now ask an adult 'What is that?

Philosophy is a battle against the bewitchment of our intelligence by means of language.