Every idea I get I have to deny, that's my way of testing it.
One must be truthful with oneself about one's own motives, especially if one is to survive in the world. It takes rigor, and it takes courage.
There are only two kinds of scholars; those who love ideas and those who hate them.
If religion is only human, and its form is man's form, it follows that everything in religion is true.
Nothing is more dangerous than an idea when it is the only one you have.
We prove what we want to prove, and the real difficulty is to know what we want to prove.