Having integrity and a clear conscience will keep your self-esteem up and self-esteem is pivotal to personal development! Do not cut corners, make excuses or give yourself other reasons to feel like you are not giving life your best effort. All of those little things will add up to a weight that will burden you with guilt and stop your success dead in its tracks, not to mention keeping you from getting a good night sleep.
For complete personal development, don't overlook your body. Many people see personal development as a mind journey, but overlook the fact that our bodies and minds are deeply connected. Build exercise into your personal development plan. You'll find that your overall personal growth will be sped up when you approach it with both systems in mind.