Only the soul that loves is happy

Science and art belong to the whole world, and before them vanish the barriers of nationality.

Nothing is more damaging to the truth than an old error.

Men's prejudices rest upon their character for the time being and cannot be overcome, as being part and parcel of themselves. Neither evidence nor common sense nor reason has the slightest influence upon them.

To accept good advice is but to increase one's own ability.

A great revolution is never the fault of the people, but of the government.

He alone deserves liberty and life who daily must win them anew.