God forbid that Truth should be confined to Mathematical Demonstration!
He who wants, but doesn't act, is a pest.
If Christianity was morality, Socrates would be the Saviour.
You cannot have Liberty in this world without what you call Moral Virtue, and you cannot have Moral Virtue without the slavery of that half of the human race who hate what you call Moral Virtue.
No bird soars too high if he soars with his own wings.
Without contraries there is no progression.