The deadliest foe to virtue would be complete self-knowledge.

The one self-knowledge worth having is to know one's own mind.

The deadliest foe of democracy is not autocracy but liberty frenzied.

True penitence condemns to silence. What a man is ready to recall he would be willing to repeat.

Adam knew Eve his wife and she conceived. It is a pity that this is still the only knowledge of their wives at which some men seem to arrive.

The ancient sage who concocted the maxim, Know Thyself might have added, Don't Tell Anyone!