Go for it now. The future is promised to no one.
The secret of getting ahead is getting started.
Who seeks shall find.
After a storm comes a calm.
The wise does at once what the fool does at last.
You never know what motivates you.
Leap, and the net will appear.
Always desire to learn something useful.
It's always too early to quit.
Never complain and never explain.
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.