1. "The only way to achieve the impossible is to believe it is possible." - Charles Kingsleigh
2. "Success is not final, failure is not fatal: It is the courage to continue that counts." - Winston S. Churchill
3. "Your time is limited, don't waste it living someone else's life." - Steve Jobs
4. "Believe you can and you're halfway there." - Theodore Roosevelt
5. "The only limit to our realization of tomorrow will be our doubts of today." - Franklin D. Roosevelt
6. "Success is stumbling from failure to failure with no loss of enthusiasm." - Winston S. Churchill
7. "Don't watch the clock; do what it does. Keep going." - Sam Levenson
8. "The only place where success comes before work is in the dictionary." - Vidal Sassoon
9. "Success usually comes to those who are too busy to be looking for it." - Henry David Thoreau
10. "You don't have to be great to start, but you have to start to be great." - Zig Ziglar
11. "Believe in yourself and all that you are. Know that there is something inside you that is greater than any obstacle." - Christian D. Larson
12. "It's not about how hard you hit. It's about how hard you can get hit and keep moving forward." - Rocky Balboa
13. "The only person you are destined to become is the person you decide to be." - Ralph Waldo Emerson
14. "Opportunities don't happen. You create them." - Chris Grosser
15. "The future belongs to those who believe in the beauty of their dreams." - Eleanor Roosevelt
...And so on! If you need more, let me know!