A few nice ones....

1. Impossible says I'm possible!
2. When there is no wind, row!
3. Work hard to get what you like, or you will be forced to like what you get!
4. You fail - only when you stop trying!
   
5. If at all you want to do anything behind a back, pat it!
6. At times of distress, behave like a duck - keep calm and unruffled on the surface, but keep paddling away like crazy underneath!
7. Take time to laugh - its the music of the soul!
8. No doubt great heights are what attract us; learn to respect the steps though!
9. Enjoying something makes it unforgettable!
10. To be the best, be daring, be different and be there first!
11. Home is where the heart is!
12. A hungry man always appreciates his bread!
13. If you can do it in front of someone you love and respect, its right.
14. Love me when I least deserve it; cause that's when I really need it!
15. I can't remember to forget you..
16. We may have inherited the earth from our parents, but it is the property of our children.
17. Atoms don't exist....entities are the in thing!
18. "The only way to get rid of a temptation is to yield to it."
    - Oscar Wilde (1854-1900)
19. "The most exciting phrase to hear in science, the one that heralds new discoveries, is not 'Eureka!' but 'That's funny... '"
    — Isaac Asimov
20. "The trouble with land is that they're not making it anymore!"
    - Will Rogers
21. "Don't let school interfere with your learning!"

Disclaimer: None of this is original - all borrowed! Some from the web, some from insightful tags of friends on messenger!!