Sacrifice life to truth.

Physical evils destroy themselves, or they destroy us.

Reading, solitude, idleness, a soft and sedentary life, intercourse with women and young people, these are perilous paths for a young man, and these lead him constantly into danger.

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

Behold the works of our philosophers; with all their pompous diction, how mean and contemptible they are by comparison with the Scriptures! Is it possible that a book at once so simple and sublime should be merely the work of man?

That man is truly free who desires what he is able to perform, and does what he desires.

If there were a people consisting of gods, they would be governed democratically. So perfect a government is not suitable to men.