John Maxwell is a Master at teaching Leadership and Personal Development.
I have read just about all of the many books he’s written. Several of them multiple times. This is taken from one of his most recent books The 15 Invaluable Laws of Growth and is a simple truth that will help you if you take it to heart:
“You must develop yourself to be successful. All the time I see people with purpose who are inconsistent in their progress. They have the ambition to succeed and they show the aptitude for their job, yet they do not move forward. Why? Because they think they can master their job and don’t need to master themselves. What a mistake. Your future is dependent on your personal growth. Improving yourself daily guarantees you a future filled with possibilities. When you expand yourself, you expand your horizons, your options, your opportunities, your potential.”-John Maxwell