Here are 10 powerful motivational quotes:

1. "It does not matter how slowly you go as long as you do not stop." - Confucius
2. "It always seems impossible until it's done." - Nelson Mandela
3. "Ever tried. Ever failed. No matter. Try Again. Fail again. Fail better." - Samuel Beckett
4. "Our greatest weakness lies in giving up. The most certain way to succeed is always to try just one more time." - Thomas A. Edison
5. "Good, better, best. Never let it rest. 'Til your good is better and your better is best." - St. Jerome
6. "If you're going through hell, keep going." - Winston S. Churchill
7. "Quality is not an act, it is a habit." - Aristotle
8. "Believe in yourself and all that you are. Know that there is something inside you that is greater than any obstacle." - Christian D. Larson
9. "The most valuable possession you can own is an open heart. The most powerful weapon you can be is an instrument of peace." - Carlos Santana
10. "That which does not kill us makes us stronger." - Friedrich Nietzsche ^{1 2}