To know oneself, one should assert oneself.
Expect problems and eat them for breakfast.
The dog that trots about finds a bone.
After a storm comes a calm.
If you're going through hell, keep going.
Be kind whenever possible. It is always possible.
Who seeks shall find.
Be thine own palace, or the world's thy jail.
Do not weep do not wax indignant. Understand.
Only the educated are free.
As for everything else, so for a mathematical theory: beauty can be perceived but not explained.