Be kind whenever possible. It is always possible.
It's always too early to quit.
I can, therefore I am.
The secret of getting ahead is getting started.
Leap, and the net will appear.
The wise does at once what the fool does at last.
To be a good loser is to learn how to win.
You never know what motivates you.
Problems are not stop signs, they are guidelines.
What you do today can improve all your tomorrows.
Crabbed and obscure definitions are of no use beyond a narrow circle of students, of whom probably every one has a pet one of his own.