What are the aims which are at the same time duties? They are perfecting of ourselves, the happiness of others.

The more we come in contact with animals and observe their behaviour, the more we love them, for we see how great is their care of the young.

Enthusiasm is always connected with the senses, whatever be the object that excites it. The true strength of virtue is serenity of mind, combined with a deliberate and steadfast determination to execute her laws. That is the healthful condition of the moral life; on the other hand, enthusiasm, even when excited by representations of goodness, is a brilliant but feverish glow which leaves only exhaustion and languor behind.

Dare to know! Have the courage to use your own intelligence!

There is a limit where the intellect fails and breaks down, and this limit is where the questions concerning God and freewill and immortality arise.

Better the whole people perish than that injustice be done

Thrift is care and scruple in the spending of one's means. It is not a virtue and it requires neither skill nor talent.