In his instructions, the Apostle Paul condemns the whole domain of this passion. He begins with the first delights in the movements of the flesh, and embraces the whole range of deeds, habits, and ways of life in which it rules.
St. Chrysostom writes: "Here the Apostle also shows the way one must become chaste, namely, by cutting off lustful passions." This means its first movements, impulses, and attractions.
Blessed Theophylact adds: "By lustful passion the Apostle means everything that inflames lust: pleasures, entertainments, idleness, luxury, and the rest. One must abstain from all that inflames lust if one wishes to be chaste."
Because of its destructive effects on soul and body, this passion is called by the Apostle evil desire (Col 3:5). Because it degrades the rational creature, it is called a passion of dishonor (Rom 1:26).
"As the Gentiles who do not know God." It is reliably known that in those times the Romans and Greeks openly surrendered themselves to every unbridled form of this passion. Even now, persons and peoples returning to pagan views of life are chiefly enslaved to this passion.
To explain why the pagans and all who imitate them are like this, the Apostle points to ignorance of God. Ignorance of God here means not intellectual ignorance, but chiefly ignorance in the heart and conscience.
In the latter case, even with good theoretical knowledge, the fear of God departs from the heart. With it departs the only strong guardian of purity. What good can be expected from such a person?
Whoever does not remember God and has no fear of God gives himself without restraint to shameful deeds. "The pagans are such because they do not suppose that there will be future punishment" (Chrysostom). "Not knowing God, they do not expect due recompense for deeds, and they do everything only for their own pleasure" (Oecumenius).
By placing those who indulge lustful passion alongside pagans who do not know God, the Apostle gives Christians a strong incentive to restraint. They have loved Christianity and have come to know its great value.
From the moment of faith, Christians separated themselves from pagans both in their concepts and in their conduct. They counted it an honor that they had become other than what they had been before.
The danger of returning to the old life powerfully stirred in them the energy to avoid such deeds and occasions. This is what the Apostle sets before them.
"It is also a strong way to turn one away from fornication, that the fornicator is placed in the same rank as those who do not know God" (Damascene).
"The Apostle speaks as though saying: you have been freed from error and have come to know the true God. Therefore do not imitate those living in the darkness of ignorance, and do not be enslaved to lustful passion" (Theodoret).