2 Peter 1:8
for these things existing and abounding in you make you to be neither idle nor unfruitful as regards the knowledge of our Lord Jesus Christ;
2 Timothy 2:21
If therefore one shall have purified himself from these, in separating himself from them, he shall be a vessel to honour, sanctified, serviceable to the Master, prepared for every good work.
Can a man be profitable to God? surely it is unto himself that the wise man is profitable.
I exhort thee for my child, whom I have begotten in my bonds, Onesimus,
once unserviceable to thee, but now serviceable to thee and to me:
2 Timothy 4:11
Luke alone is with me. Take Mark, and bring him with thyself, for he is serviceable to me for ministry.