To know oneself, one should assert oneself.
After a storm comes a calm.
If you can dream it, you can do it.
Do not weep do not wax indignant. Understand.
Always desire to learn something useful.
Be thine own palace, or the world's thy jail.
Never complain and never explain.
Things do not happen. Things are made to happen.
You never know what motivates you.
The wise does at once what the fool does at last.
As for everything else, so for a mathematical theory: beauty can be perceived but not explained.