The secret of liberty is to enlighten men, as that of tyranny is to keep them in ignorance. Maximilien Robespierre
Of all those in the army close to the commander none is more intimate than the secret agent; of all rewards none more liberal than those given to secret agents; of all matters none is more confidential than those relating to secret operations. Sun Tzu
The secret to humor is surprise. Aristotle
The secret of life is not to do what you like, but to like what you do. American Proverb
If the secret sorrows of everyone could be read on their forehead, how many who now cause envy would suddenly become the objects of pity. Italian Proverb
The secret of an old woman scolding. Irish Proverb