If you've got a talent, protect it.
It's always too early to quit.
You never know what motivates you.
I can, therefore I am.
Who seeks shall find.
Things do not happen. Things are made to happen.
To be a good loser is to learn how to win.
If you think you can do it, you can.
Always desire to learn something useful.
Know or listen to those who know.
I broke down while at Oxford, was rejected by a record number of medical tribunals during the War, and finally got permission to leave Oxford and do civilian work till the War ended.