1 Corinthians 7:32, 34

But I would have you without carefulness. He that is unmarried careth for the things that belong to the Lord, how he may please the Lord

There is difference also between a wife and a virgin. The unmarried woman careth for the things of the Lord, that she may be holy both in body and in spirit: but she that is married careth for the things of the world, how she may please her husband.