The only way to do great work is to love what you do.
A mathematician's work is never done; there are always more problems to solve.
La literatura no sirve para nada, y por eso es imprescindible.
The freedom then of man, and liberty of acting according to his own will, is grounded on his having reason, which is able to instruct him in that law he is to govern himself by, and make him know how far he is left to the freedom of his own will.
The details are not the details. They make the design.