- Lack of well defined purpose in life
- Lack of ambition to rise above mediocrity
- Insufficient education
- Lack of self discipline
- Lack of persistence
- Wrong selection of vocation
- Lack of concentration of effort
Those that particularly apply to me are italicised.
I agree with Hill's views that "no man can succeed in a line of endeavor which he does not like" and that "one of the keys to success is therefore identifying your passion and life-career purpose."