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

Where two principles really do meet which cannot be reconciled with one another, then each man declares the other a fool and a heretic

Elementary propositions consist of names.

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

Resting on your laurels is as dangerous as resting when you are walking in the snow. You doze off and die in your sleep.

I am still at Trattenbach, surrounded, as ever, by odiousness and baseness. I know that human beings on the average are not worth much anywhere, but here they are much more good-for-nothing and irresponsible than elsewhere.

Not only is there no guarantee of the temporal immortality of the human soul, that is to say of its eternal survival after death; but, in any case, this assumption completely fails to accomplish the purpose for which it has always been intended. Or is some riddle solved by my surviving forever? Is not this eternal life itself as much of a riddle as our present life?