Rather suffer an injustice than commit one.

Chemistry... is like the maid occupied with daily civilisation; she is busy with fertilisers, medicines, glass, insecticides ... for she dispenses the recipes.

Why should we build our happiness on the opinons of others, when we can find it in our own hearts?

One can buy anything with money except morality.

I may be no better, but at least I am different.

Not all the subtilties of metaphysics can make me doubt a moment of the immortality of the soul, and of a beneficent Providence. I feel it, I believe it, I desire it, I hope it, and will defend it to my last breath.

In any case, frequent punishments are a sign of weakness or slackness in the government. There is no man so bad that he cannot be made good for something. No man should be put to death, even as an example, if he can be left to live without danger to society.