You can't think decently if you're not willing to hurt yourself

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

We find certains things about seeing puzzling, because we do not find the whole business of seeing puzzling enough.

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.

Genius is talent in which character makes itself heard.

The real discovery is the one which enables me to stop doing philosophy when I want to. The one that gives philosophy peace, so that it is no longer tormented by questions which bring itself into question.

If I have exhausted the justifications, I have reached bedrock and my spade is turned. Then I am inclined to say: 'This is simply what I do.