Sad is his lot, who, once at least in his life, has not been a poet.

Good manners require space and time.

It is because of the servility of photography that I am fundamentally contemptuous of this chance invention which will never be an art but which plagiarizes nature by means of optics. (1848)

Brutality to an animal is cruelty to mankind - it is only the difference in the victim.

Assassination makes only martyrs, not converts.

Argument should be polite as well as logical.

Private passions grow tired and wear themselves out; political passions, never.