There is difference also between a wife and a virgin. The unmarried woman cares for the things of the Lord, that she may be holy both in body and in spirit: but she that is married cares for the things of the world, how she may please her husband.
All Commentaries on 1 Corinthians 7:34 Go To 1 Corinthians 7
Ambrosiaster
AD 400
It is the human spirit which either sanctifies or corrupts the body. If anyone tries to have a pure body but a corrupt soul, he will soon have to choose between them. Either the soul must be honored, or the body will be drawn toward corruption. Commentary on Paul’s Epistles.