John Chrysostom

"Know ye not that your body is a temple of the Holy Ghost which is in you?" He did not merely say, "of the Spirit," but, "which is in you;" which was the part of one who also was soothing. And again, explaining himself still further, he added, "which ye have from God." He mentioned Him that gave also, both exalting the hearer and putting him in fear, both by the magnitude of the deposit, and by the munificence of Him that made it. "And ye are not you own." This is not only to abash, but even to force men towards virtue. …

Homily on 1 Corinthians 18 ↗

Theophylact of Ohrid

You, he says, are under the Master and have nothing of your own; the body itself is not yours. "For you were bought with a dear price," that is, with the Blood of Christ. Therefore your members are subject to another Master, and to whatever is pleasing to Him, to that you must direct their activity. In saying this, he does not abolish free will, but shows that God, by Whom we have been redeemed, rightfully demands from us service to Himself.

Commentary on 1 Corinthians ↗

Ignatius of Antioch

There is nothing which is hid from God, but our very secrets are near to Him. Let us therefore do all things as those who have Him dwelling in us, that we may be His temples, and He may be in us as our God, which indeed He is, and will manifest Himself before our faces. Wherefore we justly love Him.

Epistle of Ignatius to the Ephesians ↗

Thomas Aquinas

Then when he says, Do you not know, he presents the fourth reason, which is taken from the dignity of grace, which arises from two sources, namely, from the grace of the Holy Spirit and from the redemption of Christ's blood. In regard to this he does three things: first, he declares the dignity of our body, which it has from the grace of the Holy Spirit, saying: Do you not know, as though you should not be unaware of it, that your body, namely, bodily, is a temple of the Holy Spirit, just as he said above (3:16): "Do you not know …

Commentary on 1 Corinthians ↗

Bonaventure

To approach Christ is through faith, or through the Sacrament of faith; and the faith of Christ is the same in past, present, and future: therefore the ground of influencing is posited in Christ with respect to all, past as well as present as well as future, who believe in Christ and are reborn in Christ, who through faith are joined to Christ and through inflowing grace become members of Christ and temples of the Holy Spirit, and thereby children of God the Father, connected to one another through the indivisible bond of charity. …

Breviloquium ↗