Go for it now. The future is promised to no one.
Who seeks shall find.
Always desire to learn something useful.
To be a good loser is to learn how to win.
The secret of getting ahead is getting started.
Leap, and the net will appear.
You never know what motivates you.
If you think you can do it, you can.
If you've got a talent, protect it.
Be kind whenever possible. It is always possible.
When I was about 13 or 14, I had an English teacher who made a deal with me that I could get out of doing all of the year's regular work if I would write a short story a week and on Friday read it to the class.