'Able' in the Bible

Abner repeated again, “Turn away from following me. Why should I have to strike you to the ground? How would I be able to face Joab your brother [and look him in the eye]?”

But the men said, “You should not go out [to battle with us]. For if in fact we retreat, they will not care about us; even if half of us die, they will not care about us. But you are worth ten thousand of us. So now it is better that you be ready to help us from the city [of Mahanaim].”

“He makes my feet like the doe’s feet [firm and swift];He sets me [secure and confident] on my high places.