Treasury of Scripture Knowledge
So likewise ye, when ye shall have done all those things which are commanded you, say, We are unprofitable servants: we have done that which was our duty to do.
Throw out that worthless servant into the [place of] outer darkness, where there will be crying and excruciating pain.
Everyone has turned away [from God]. All of them have become worthless. No one is [always] kind; no, not even one person."
Or, who has given [something] to God that He has to pay back?
1 Corinthians 9:16
[But] I do not have anything to boast about if I preach the good news because I am compelled to do it. For it would be too bad for me if I did not preach the good news.
1 Corinthians 15:9
For I am the least [significant] of the apostles, and am not worthy to be called an apostle, because I persecuted the church of God.
What is more, I consider everything to be a loss compared to the surpassing value of knowing Christ Jesus [as] my Lord, for whose sake I have suffered the loss of all things. [I now] consider [all of] them to be trash, in order to gain Christ
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].
1 Peter 5:5
And in the same way, you younger [Christians] should be [respectfully] submissive to the older ones. And all of you should [be willing to] humbly serve one another, for God stands opposed to [the efforts of] proud people, but extends His unearned favor to those [who serve] with humility.