There is no quality in this world that is not what it is merely by contrast. Nothing exists in itself.
There may be no heroic connotation to the word “persistence,” but the quality is to the character of man what carbon is to steel.[Also known as:]Persistence is to the character of man as carbon is to steel.
Never talk to women about your own good qualities. Let them find out for themselves.[Никогда с женщинами не говорите о своих добродетелях. Пусть они сами поймут.]