Genius is what makes us forget the master's talent.

My attitude towards him is an attitude towards a soul. I am not of the opinion that he has a soul. . . .

Since social relationships are always ambiguous, since my thought is only a unit, since my thoughts create rifts as much as they unite, since my words establish contacts by being spoken and create isolation by remaining unspoken, since an immense moat separates the subjective certitude that I have for myself from the objective reality that I represent to others, since I never stop finding myself guilty even though I feel I am innocent.

What we cannot speak about we must pass over in silence.

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

Don't think, but look! (PI 66)

If you tried to doubt everything you would not get as far as doubting anything. The game of doubting itself presupposes certainty.