Here are 20 quotes that cover various aspects of life:

1. "The only person you should try to be better than is the person you were yesterday." - Unknown

2. "In the end, we will remember not the words of our enemies, but the silence of our friends." - Martin Luther King Jr.

3. "Success is not final, failure is not fatal: It is the courage to continue that counts." - Winston Churchill

4. "The greatest glory in living lies not in never falling, but in rising every time we fall." - Nelson Mandela

5. "The only limit to our realization of tomorrow will be our doubts of today." - Franklin D. Roosevelt

6. "Life is really simple, but we insist on making it complicated." - Confucius

7. "Don't watch the clock; do what it does. Keep going." - Sam Levenson

8. "The best time to plant a tree was 20 years ago. The second best time is now." - Chinese Proverb

9. "You miss 100% of the shots you don't take." - Wayne Gretzky

10. "Believe you can and you're halfway there." - Theodore Roosevelt

11. "Happiness is not something readymade. It comes from your own actions." - Dalai Lama

12. "The only way to do great work is to love what you do." - Steve Jobs

13. "Strive not to be a success, but rather to be of value." - Albert Einstein

14. "It does not matter how slowly you go as long as you do not stop." - Confucius

15. "The future depends on what you do today." - Mahatma Gandhi

16. "The only true wisdom is in knowing you know nothing." - Socrates

17. "Be yourself; everyone else is already taken." - Oscar Wilde

18. "The journey of a thousand miles begins with one step." - Lao Tzu

19. "Success is walking from failure to failure with no loss of enthusiasm."