The difference between a successful person and others is not the lack of strength or a lack of knowledge but rather a lack of will. (Vince Lombardi, late professional football coach)
No doubt Lombardi used this statement in the context of sports to motivate his players. He knew their strength and he taught them the fundamentals of football. What he felt they lacked was a greater determination to put their best effort into winning games. It has a fitting application to all of life, too. So, add your will to your abilities to achieve success.
And whatsoever you do, do it heartily, as to the Lord, and not unto men (Colossians 3:23).