Ability hits the mark where presumption overshoots and diffidence falls short.--John Henry Newman 

Ability is of little account without opportunity.--Napoleon Bonaparte 

Ability is what you're capable of doing. Motivation determines what you do. Attitude determines how well you do it.--Lou Holtz 

Ability may get you to the top, but it takes character to keep you there.–-John Wooden 

Ability without honor is useless.--Marcus Tullius Cicero