Leap, and the net will appear.
Know or listen to those who know.
By failing to prepare, you are preparing to fail.
Begin to be now what you will be hereafter.
If you're going through hell, keep going.
Who seeks shall find.
Either you run the day or the day runs you.
The wise does at once what the fool does at last.
Go for it now. The future is promised to no one.
It's always too early to quit.
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.