What would you do if you knew for sure that no one would ever find out?

The mistakes of the fool are known to the world, but not to himself. The mistakes of the wise man are known to himself, but not to the world.

Those who visit foreign nations, but who associate only with their own countrymen, change their climate, but not their customs 'caelum non animum mutant': they see new meridians, but the same men, and with heads as empty as their pockets.

Constant success shows us but one side of the world. For as it surrounds us with friends who will tell us only our merits, so it silences those enemies from whom alone we can learn our defects.

It is not until we have passed through the furnace that we are made to know how much dross there is in our composition.

He that studies books alone, will know how things ought to be; and he that studies men, will know how things are.

Brutes leave ingratitude to man.