These are taken from the book “Think and Grow Rich” by Napoleon Hill.
The Thirty-One Major Causes of Failure

1. Unfavorable hereditary background
2. Lack of a well-defined purpose in life
3. Lack of ambition to aim above mediocrity
4. Insufficient education
5. Lack of self-discipline
6. Ill health
7. Unfavorable environmental influences during childhood
8. Procrastination
9. Lack of persistence
10. Negative personality
11. Lack of controlled sexual urge
12. Uncontrolled desire for “something for nothing”
13. Lack of a well defined power of decision
14. One or more of the six basic fears (described in a later chapter)
15. Wrong selection of a mate in marriage
16. Over-caution
17. Wrong selection of associates in business
18. Superstition and prejudice
19. Wrong selection of a vocation
20. Lack of concentration of effort
21. The habit of indiscriminate spending
22. Lack of enthusiasm
23. Intolerance
24. Intemperance
25. Inability to cooperate with others
26. Possession of power that was not acquired through self effort
27. Intentional dishonesty
28. Egotism and vanity
29. Guessing instead of thinking
30. Lack of capital

Some of us will look at the list and think we are doomed to failure because we can check off quite a few and apply them to ourselves, but most of these shortcomings are things that can be corrected, and for those elements you can’t change you can try to find ways around. Which would make persistence your greatest asset, not quitting, taking the attitude of one who will win or die trying.