The ability to do something is the quality or skill that you have, which make it possible for you to do it. It ir from the root word able you need the trigger of ability to succeed, because as long as you see yourself as being unable to succeed, you will never have the ability to. In numbers13, twelve people were sent out on a mission to spy out canaan. Ten of them came back with a report of israel's inability to possess the land. But joshua and caleb saw it differently. They saw their ability to possess the land and they actually did, while the men who brought evil report all died in the wilderness. If you can't see your ability to do a job or to succeed,you will never do it or succeed.