'Able' in the Bible

Can the Cushite change his skin,or a leopard his spots?If so, you might be able to do what is good,you who are instructed in evil.

Rise up, you cavalry!Race furiously, you chariots!Let the warriors go out—Cush and Put,who are able to handle shields,and the Ludim,who are able to handle and string the bow.

No one will be able to retrieve a cornerstoneor a foundation stone from you,because you will become desolate forever.This is the Lord’s declaration.