BROTHERS and SISTERS, you say, “all things are lawful for me,” but not all things are beneficial. “All things are lawful for me,” but I will not be dominated by anything. “Food is meant for the stomach and the stomach for food,” but God will bring to nothing both of them. However, the body is not meant for sexual immorality, but for the Lord, and the Lord for the body. And God raised up the Lord and will also raise us up by His power. Do you not know that your bodies are members of Christ? Should I then take the members of Christ and make them members of a prostitute? May it never be! Or do you not know that whoever is united to a prostitute becomes one body with her? For God says, “The two will become one flesh” (Genesis 2:24). But anyone united to the Lord becomes one spirit with Him. Flee sexual immorality! Every sin that a person commits is outside the body, but anyone committing sexual immorality sins against their own body. Or do you not know that your body is a temple of the Holy Spirit, Who is in you, Whom you have from God, and that you are not your own? For you were bought at a price; therefore, glorify God in your body and in your spirit, which belong to God.
Saint Ignatius of Antioch says that
The Lord overlooks nothing. Even secrets are open to Him. Let us then do everything as if He were dwelling in us. Thus we shall be His temples, and He will be within us as our God - as He actually is. This will be clear to us just to the extent that we love Him rightly.