'Concerns' in the Bible

For who among men knows the thoughts of a man except the spirit of the man that is in him? In the same way, no one knows the thoughts of God except the Spirit of God.

I want you to be without concerns. An unmarried man is concerned about the things of the Lord—how he may 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.