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

Propositions show what they say: tautologies and contradictions show that they say nothing.

What is left over if I subtract the fact that my arms goes up from the fact that I raise my arm?

The truth of the thoughts that are here set forth seems to me unassailable and definitive. I therefore believe myself to have found, on all essential points, the final solution of the problems. And if I am not mistaken in this belief, then the second thing in which the value of this work consists is that it shows how little is achieved when these problems are solved.

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.

One often makes a remark and only later sees how true it is.

Genius is talent exercised with courage.