School has no task more important than to teach strict thought, cautious judgment, and logical conclusions, hence it must pay no attention to what hinders these operations, such as religion, for instance.

If ye would go up high, then use your own legs! Do not get yourselves carried aloft; do not seat yourselves on other people's backs and heads!

I do not give alms; I am not poor enough for that.

With one more talent one frequently stands with greater instability than with one less, as a table stands better on three legs than on four.

I am not bigoted enough for a system-and not even for my system.

The surest way to corrupt a youth is to instruct him to hold in higher esteem those who think alike than those who think differently.

It takes physical courage to indulge in wickedness. The "good" are too cowardly to do it.