Scientific progress makes moral progress a necessity; for if man's power is increased, the checks that restrain him from abusing it must be strengthened.

Liberty is the only idea which circulates with the human blood, in all ages, in all countries, and in all literature - liberty that is, and what cannot be separated from liberty, a love of country.

O memory, thou bitter sweet,--both a joy and a scourge!

The mind may be exhausted, but the language of the heart is inexhaustible.

We understand death for the first time when he puts his hand upon one whom we love

I am glad that I am not a man, for then I should have to marry a woman.

inventiveness is childish, practice sublime.