2 Peter 1:8
For if these qualities are yours and are increasing, they will keep you from being useless or unfruitful in the knowledge of our Lord Jesus Christ.
2 Timothy 2:21
So if anyone purifies himself from anything dishonorable, he will be a special instrument, set apart, useful to the Master, prepared for every good work.
Can a man be of any use to God?
Can even a wise man be of use to Him?
appeal to you for my son, Onesimus. I fathered him while I was in chains.
Once he was useless to you, but now he is useful both to you and to me.
2 Timothy 4:11
Only Luke is with me. Bring Mark with you, for he is useful to me in the ministry.