Not in the lust of concupiscence - In gross gratifications.
Even as the Gentiles - This was, and is, a common vice among the pagan; see the Acts 15:20 note; Romans 1:29 note; Ephesians 4:17-18 notes, and the reports of missionaries everywhere.
Which know not God - See the Romans 1:21, Romans 1:28 notes; Ephesians 2:12 note.

Not in the lust of concupiscence - Having no rational object, aim, nor end. Some say, "not like beasts;" but this does not apply as they who use it wish, for the males and females of the brute creation are regular and consistent in their intercourse, and scarcely ever exceed such bounds as reason itself would prescribe to those most capable of observing and obeying its dictates.
The Gentiles which know not God - These are the beasts; their own brutes are rational creatures when compared with them. Enough has been said on this subject on Romans 1, and 2: They who wish to see more may consult Juvenal, and particularly his 6th and 9th Satires; and indeed all the writers on Greek and Roman morals.

(4) Not in the lust of concupiscence, even as the Gentiles which know not God:
(4) The third, because the saints are distinguished by honesty and purity from those who do not know God.

Not in the lust of concupiscence,.... Or "passion of lust"; for the mere gratifying and indulging of that; for a man so to possess his vessel, is to cherish the sin of concupiscence, the first motions of sin in the heart, by which a man is drawn away, and enticed; to blow up the flame of lust, and to make provision for the flesh to fulfil the lusts thereof:
even as the Gentiles which know not God; for, though they knew him, or might know him with a natural knowledge, by the light and works of nature, yet they knew him not savingly and spiritually, as he is revealed in the word, of which they were destitute; or as the God of all grace, and the God and Father of Christ, or as he is in Christ: and though by the light of nature they might know there was a God, yet they knew not who that God was; nor did they act up to that light and knowledge they had; they did not glorify him as God, by ascribing to him what was his due; nor were they thankful for the mercies they received from him; nor did they fear, love, worship, and serve him; nor did they like to retain him in their knowledge, and therefore were given up to judicial blindness and hardness, to a reprobate mind, and to vile affections, and so did things very inconvenient, unnatural, and dishonourable. Wherefore, for a man to use either his wife or his body in any unchaste and dishonourable manner, for the gratifying of his lusts, is to act an Heathenish part; a like argument, dissuading from things unlawful, is used in Matthew 6:32.

in the lust--Greek, "passion"; which implies that such a one is unconsciously the passive slave of lust.
which know not God--and so know no better. Ignorance of true religion is the parent of unchastity (Ephesians 4:18-19). A people's morals are like the objects of their worship (Deuteronomy 7:26; Psalm 115:8; Romans 1:23-24).

Not in passionate desire - Which had no place in man when in a state of innocence. Who know not God - And so may naturally seek happiness in a creature. What seemingly accidental words slide in; and yet how fine, and how vastly important!