It's always too early to quit.
The dog that trots about finds a bone.
I can, therefore I am.
To be a good loser is to learn how to win.
Well done is better than well said.
Know or listen to those who know.
After a storm comes a calm.
Be gentle to all and stern with yourself.
Always desire to learn something useful.
The most effective way to do it, is to do it.
Fullness of knowledge always means some understanding of the depths of our ignorance and that is always conducive to humility and reverence.