Luke 14:34-35

Therefore salt is good, but if it loses its flavoring [ability], how will it ever get it back again?

Romans 3:12

Everyone has turned away [from God]. All of them have become worthless. No one is [always] kind; no, not even one person."

Treasury of Scripture Knowledge

Summary

Then I went to Euphrates, and digged, and took the girdle from the place where I had hid it: and, behold, the girdle was marred, it was profitable for nothing.

Bible References

It was

Luke 14:34
Therefore salt is good, but if it loses its flavoring [ability], how will it ever get it back again?
Romans 3:12
Everyone has turned away [from God]. All of them have become worthless. No one is [always] kind; no, not even one person."
Philemon 1:11
He was once useless to me, but is now useful to [both] you and me. [Note: Since the name Onesimus means "useful," it appears Paul is making an intentional play on the word].