I prefer liberty with danger than peace with slavery.

The abuse of books kills science. Believing that we know what we have read, we believe that we can dispense with learning it.

Do to others as you would have others do to you, inspires all men with that other maxim of natural goodness a great deal less perfect, but perhaps more useful: Do good to yourself with as little prejudice as you can to others.

Those people who treat politics and morality separately will never understand either of them.

People who know little are usually great talkers, while men who know much say little.

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

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