To know oneself, one should assert oneself.
Never complain and never explain.
Who seeks shall find.
After a storm comes a calm.
Be gentle to all and stern with yourself.
Either you run the day or the day runs you.
Expect problems and eat them for breakfast.
Know or listen to those who know.
The wise does at once what the fool does at last.
Only the educated are free.
Most of man's problems upon this planet, in the long history of the race, have been met and solved either partially or as a whole by experiment based on common sense and carried out with courage.