The skeptic does not mean him who doubts, but him who investigates or researches, as opposed to him who asserts and thinks that he has found.

The less we read, the more harmful it is what we read.

Is there anything more terrible than a "call"? It affords an occasion for the exchange of the most threadbare commonplaces. Calls and the theatre are the two great centers for the propagation of platitudes.

Was man made for science, or was science made for man?

The supreme triumph of reason is to cast doubt upon its own validity.

My work...is to shatter the faith of men here, there, and everywhere, faith in affirmation, faith in negation, and faith in abstention from faith, and this for the sake of faith in faith itself.

Sow the living part of yourselves in the furrow of life.