You can do everything you ought to do.
No one is fully accomplished until he has acquired the ability to attend to his own business.
What lies behind us and what lies before us are minor matters compared with what lies within us.
You can always tell luck from ability by its duration.
It is better to have a little ability and use it well than to have much ability and use it poorly.
Executive ability is a talent for deciding to do something quickly and getting someone else to do it.
There is far more opportunity than there is ability.
Ability is the most important tool in your life.
Ability without ambition is like a car without an engine.
We rate ability by what people finish, not by what they attempt.