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.

Anyone who in discussion relies upon authority uses, not his understanding, but rather his memory.

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.

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

And usually [the philosopher] philosophizes either in order to resign himself to life, or to seek some finality in it, or to distract himself and forget his griefs, or for pastime and amusement.

If a person never contradicts himself, it must be that he says nothing.

To fall into a habit is to begin to cease to be.