Yes, yes, I see it all! — an enormous social activity, a mighty civilization, a profuseness of science, of art, of industry, of morality, and afterwords, when we have filled the world with industrial marvels, with great factories, with roads, museums and libraries, we shall fall exhausted at the foot of it all, and it will subsist — for whom? Was man made for science or was science made for man?

Those who say they believe in God and yet neither love nor fear Him, do not in fact believe in Him but in those who have taught them that God exists. Those who believe that they believe in God, but without any passion in their heart, any anguish of mind, without uncertainty, without doubt, without an element of despair even in their consolation, believe only in the God-idea, not in God.

Fascism is cured by reading, and racism is cured by traveling

True science teaches, above all, to doubt and be ignorant.

Man is perishing. That may be, and if it is nothingness that awaits us let us so act that it will be an unjust fate.

My aim is to agitate and disturb people. I'm not selling bread; I'm selling yeast.

The only reactionaries are those who find themselves at home in the present.