Is not the core of nature in the heart of man?

The artist may be well advised to keep his work to himself till it is completed, because no one can readily help him or advise him with it... but the scientist is wiser not to withhold a single finding or a single conjecture from publicity.

Those who hope for no other life are dead even for this.

Woe to him who would ascribe something like reason to Chance, and make a religion of surrendering to it.

Properly speaking, such work is never finished; one must declare it so when, according to time and circumstances, one has done one's best.

Well-mannered children could be conceived if the parents were well-mannered.

It is only necessary to grow old to become more charitable and even indulgent. I see no fault committed by others that I have not committed myself.