'Useful' in the Bible

The young woman was absolutely beautiful. She served the king and was very useful to him. The king was not sexually involved with her.

They destroyed their cities, and all of them threw stones onto every piece of farm land, ruining the fields. Then they filled in all the water wells and chopped down all of the useful trees. Stone walls remained surrounding Kir-hareseth only, until the archers surrounded and attacked that city.

"Can a human being be useful to God, since he, who is wise, is sufficient to himself?

I concluded that wisdom is more useful than foolishness, just as light is more useful than darkness.

After all, it's useful only for kindling a fire, isn't it? And once you've burnt up the ends and charred through the middle of it, is it useful for anything else?