If you're going through hell, keep going.
Either you run the day or the day runs you.
It's always too early to quit.
Expect problems and eat them for breakfast.
The wise does at once what the fool does at last.
Do not weep do not wax indignant. Understand.
Quality is not an act, it is a habit.
Be thine own palace, or the world's thy jail.
The dog that trots about finds a bone.
Leap, and the net will appear.
Beauty is the first test: there is no permanent place in the world for ugly mathematics.