Experience is the universal mother of sciences.

For a man to attain to an eminent degree in learning costs him time, watching, hunger, nakedness, dizziness in the head, weakness in the stomach, and other inconveniences.

The brave man carves out his fortune, and every man is the sum of his own works.

Make it thy business to know thyself, which is the most difficult lesson in the world

When the head aches, all the members partake of the pain.

Historians ought to be precise, faithful, and unprejudiced; and neither interest nor fear, hatred nor affection, should make them swerve from the way of truth.

Digo, paciencia y barajar. What I say is, patience, and shuffle the cards.