From the book Not Everyone Will Understand Your Journey : Lessons Learned from The Path Less Traveled by Zero Dean http://zerodean.com/book/
The undisciplined are slaves to moods, appetites and passions.
Just Do It: 11 Ways to Increase Your Willpower and Self-Discipline
How to Develop Self-Discipline: http://blog.iqmatrix.com/self-discipline
I believe self-discipline is something that can be learned with hard work and habit building. Here are some helpful ways that you can improve your self-discipline!
ISSUU - Self-Discipline in 10 days - How To Go From Thinking To Doing by Yaxia Hashi
49 Bible verses about Self Discipline
How to develop the self-discipline necessary to reach your goals: http://blog.iqmatrix.com/self-discipline
"Practicing Self Discipline" by co-author Michelle Cruz Rosado