Quality is not an act, it is a habit.
Well done is better than well said.
To know oneself, one should assert oneself.
The dog that trots about finds a bone.
By failing to prepare, you are preparing to fail.
Be gentle to all and stern with yourself.
Leap, and the net will appear.
To be a good loser is to learn how to win.
Be kind whenever possible. It is always possible.
Always desire to learn something useful.
The object of pure physics is the unfolding of the laws of the intelligible world the object of pure mathematics that of unfolding the laws of human intelligence.