We are of God He deduces an exhortation from his previous doctrine; for what he had declared in common as to the children of God, he now applies to those he was writing to; and this he did, to stimulate them to beware of sin, and to encourage them to repel the onsets of Satan. Let readers observe, that it is only true faith, that applies to us, so to speak, the grace of God; for the Apostle acknowledges none as faithful, but those who have the dignity of being God's children. Nor does he indeed put probable conjecture, as the Sophists speak, for confidence; for he says that we know. The meaning is, that as we have been born of God, we ought to strive to prove by our separation from the world, and by the sanctity of our life, that we have not been in vain called to so great all honor. Now, this is an admonition very necessary for all the godly; for wherever they turn their eyes, Satan has his allurements prepared, by which he seeks to draw them away from God. It would then be difficult for them to hold on in their course, were they not so to value their calling as to disregard all the hindrances of the world. Then, in order to be well prepared for the contest, these two things must be borne in mind, that the world is wicked, and that our calling is from God. Under the term world, the Apostle no doubt includes the whole human race. By saying that it lieth in the wicked one, he represents it as being under the dominion of Satan. There is then no reason why we should hesitate to shun the world, which condemns God and delivers up itself into the bondage of Satan: nor is there a reason why we should fear its enmity, because it is alienated from God. In short, since corruption pervades all nature, the faithful ought to study self-denial; and since nothing is seen in the world but wickedness and corruption, they must necessarily disregard flesh and blood that they may follow God. At the same time the other thing ought to be added, that God is he who has called them, that under this protection they may oppose all the machinations of the world and Satan.

And we know that we are of God - We who are Christians. The apostle supposed that true Christians might have so clear evidence on that subject as to leave no doubt on their own minds that they were the children of God. Compare 1-John 3:14; 2-Timothy 1:12.
And the whole world - The term "world" here evidently means not the material world, but the people who dwell on the earth, including all idolaters, and all sinners of every grade and kind.
Lieth in wickedness - "In the wicked one," or under the power of the wicked one - ἐν τῷ πονηρῷ en tō ponērō. It is true that the word πονηρῷ ponērō may be used here in the neuter gender, as our translators have rendered it, meaning "in that which is evil," or in "wickedness;" but it may be in the masculine gender, meaning "the wicked one;" and then the sense would be that the whole world is under his control or dominion. That this is the meaning of the apostle seems to be clear, because:
(1) the corresponding phrase, 1-John 5:20, ἐν τῷ ἀληθινῷ en tō alēthinō, "in him that is true," is evidently to be construed in the masculine, referring to God the Saviour, and meaning "him that is true," and not that we are "in truth."
(2) it makes better sense to say that the world lies under the control of the wicked one, than to say that it lies "in wickedness."
(3) this accords better with the other representations in the Bible, and the usuage of the word elsewhere. Compare 1-John 2:13, "Ye have overcome the "wicked" one;" 1-John 5:14, "ye have overcome the "wicked" one;" 1-John 3:12, "who was of that "wicked" one." See also the notes at 2-Corinthians 4:4, on the expression "the god of this world;" John 12:31, where he is called "the prince of this world;" and Ephesians 2:2, where he is called "the prince of the power of the air." In all these passages it is supposed that Satan has control over the world, especially the pagan world. Compare Ephesians 6:12; 1-Corinthians 10:20. In regard to the fact that the pagan world was pervaded by wickedness, see the notes at Romans 1:21-32.
(4) it may be added, that this interpretation is adopted by the most eminent critics and commentators. It is that of Calvin, Beza, Benson, Macknight, Bloomfield, Piscator, Lucke, etc. The word "lieth" here (κεῖται keitai) means, properly, to lie; to be laid; to recline; to be situated, etc. It seems here to refer to the "passive" and "torpid" state of a wicked world under the dominion of the prince of evil, as acquiescing in his reign; making no resistance; not even struggling to be free. It lies thus as a beast that is subdued, a body that is dead, or anything that is wholly passive, quiet, and inert. There is no energy; no effort to throw off the reign; no resistance; no struggling. The dominion is complete, and body and soul, individuals and nations, are entirely subject to his will. This striking expression will not unaptly now describe the condition of the pagan world, or of sinners in general. There would seem to be no government under which people are so little restive, and against which they have so little disposition to rebel, as that of Satan. Compare 2-Timothy 2:26.

We know that we are of God - Have the fullest proof of the truth of Christianity, and of our own reconciliation to God through the death of his Son.
The whole world lieth in wickedness - Εν τῳ πονηρῳ κειται· Lieth in the wicked one - is embraced in the arms of the devil, where it lies fast asleep and carnally secure, deriving its heat and power from its infernal fosterer. What a truly awful state! And do not the actions, tempers, propensities, opinions and maxims of all worldly men prove and illustrate this? "In this short expression," says Mr. Wesley, "the horrible state of the world is painted in the most lively colors; a comment on which we have in the actions, conversations, contracts, quarrels and friendships of worldly men." Yes, their Actions are opposed to the law of God; their Conversations shallow, simulous, and false; their Contracts forced, interested, and deceitful; their Quarrels puerile, ridiculous, and ferocious; and their Friendships hollow, insincere, capricious, and fickle: - all, all the effect of their lying in the arms of the wicked one; for thus they become instinct with his own spirit: and because they are of their father the devil, therefore his lusts they will do.

(18) [And] we know that we are of God, and the whole world lieth in wickedness.
(18) Every man must particularly apply to himself the general promises, that we may certainly persuade ourselves, that whereas all the world is by nature lost, we are freely made the sons of God, by the sending of Jesus Christ his son to us, of whom we are enlightened with the knowledge of the true God and everlasting life.

And we know that we are of God,.... The sons of God, and regenerated by him; this is known by the Spirit of God, which witnesses to the spirits of the saints that they are the children of God; and by the fruits and effects of regenerating grace, as love to the brethren, and the like:
and the whole world lies in wickedness; that is, the men of the world, the greater part of the inhabitants of it, who are as they were when they came into it, not being born of God; these are addicted to sin and, wickedness; the bias of their minds is to it, they are set upon it, and give themselves up to it, are immersed in it, and are under the power of it: or "in the wicked one"; Satan, the god of this world; they are under his influence, and led according to his will, and they are governed by him, and are at his beck and command; and this is known, by sad experience, it is easy of observation;
"And cannot comprehend the things that are promised to the righteous in time to come: for this world is full of unrighteousness and infirmities.'' (2 Esdras 4:27)

world lieth in wickedness--rather, "lieth in the wicked one," as the Greek is translated in 1-John 5:18; 1-John 2:13-14; compare 1-John 4:4; John 17:14-15. The world lieth in the power of, and abiding in, the wicked one, as the resting-place and lord of his slaves; compare "abideth in death," 1-John 3:14; contrast 1-John 5:20, "we are in Him that is true." While the believer has been delivered out of his power, the whole world lieth helpless and motionless still in it, just as it was; including the wise, great, respectable, and all who are not by vital union in Christ.

We know that we are children of God - By the witness and the fruit of his Spirit, 1-John 3:24. But the whole world - All who have not his Spirit, not only is "touched" by him, but by idolatry, fraud, violence lasciviousness, impiety, all manner of wickedness. Lieth in the wicked one - Void of life, void of sense. In this short expression the horrible state of the world is painted in the most lively colours; a comment on which we have in the actions, conversations, contracts, quarrels, and friendships of worldly men.