Because a fact seems strange to you, you conclude that it is not one. ... All science, however, commences by being strange. Science is successive. It goes from one wonder to another. It mounts by a ladder. The science of to-day would seem extravagant to the science of a former time. Ptolemy would believe Newton mad.

Amnesty is as good for those who give it as for those who receive it. It has the admirable quality of bestowing mercy on both sides.

Perseverance, secret of all triumphs.

Work is the law of life, and to reject it as boredom is to submit to it as torment.

I'd rather be hissed at for a good verse, than applauded for a bad one.

Slaves would be tyrants were the chance theirs.

Youth is the future smiling at a stranger, which is itself.