A reasonable man adjusts himself to the world. An unreasonable man expects the world to adjust itself to him. Therefore all progress is made by unreasonable people.
Happiness does not consist in having what you want, but in wanting what you have
Excess weakens the spirits.
True wisdom is knowing what you don't know
It cannot be when the root is neglected that what springs from it will be well ordered.
Learning, undigested by thought, is labor lost.