'Concerns' in the Bible

Who are you that you should find fault with the servant of another? Whether he stands or falls is a matter which concerns his own master. But stand he will; for the Master can give him power to stand.

And I would have you free from worldly anxiety. An unmarried man concerns himself with the Lord's business--how he shall please the Lord;

but a married man concerns himself with the business of the world--how he shall please his wife.

There is a difference too between a married and an unmarried woman. She who is unmarried concerns herself with the Lord's business--that she may be holy both in body and spirit; but the married woman concerns herself with the business of the world--how she shall please her husband.

Everybody concerns himself about his own interests, not about those of Jesus Christ.