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.

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

I give no sources, because it is indifferent to me whether what I have thought has already been thought before me by another.

My day passes between logic, whistling, going for walks, and being depressed. I wish to God that I were more intelligent and everything would finally become clear to me - or else that I needn't live much longer.

The sole remaining task for philosophy is the analysis of language.

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

That the world is, is the mystical.