They are of the world: therefore speak they of the world, and the world heareth them.

They are of the world: therefore of the world they speak, and the world heareth them.

They are of the world; for this reason they speak as of the world, and the world hears them.

They, of the world they are; because of this from the world they speak, and the world doth hear them;

They are the world's children, and so their language is that of the world, and the world listens to them. We are God's children.

They are of the world, so their talk is the world's talk, and the world gives ear to them.

They are of the world. Therefore, they speak about the world, and the world listens to them.

Those people belong to the world and therefore they speak as the world speaks, and the world listens to them.

They are of the world It is no small consolation that they who dare to assail God in us, have only the world to aid and help them. And by the world the Apostle means that portion of which Satan is the prince. Another consolation is also added, when he says that the world embraces through the false prophets that which it acknowledges as its own. [1] We see what great propensity to vanity and falsehood there is in men. Hence false doctrines easily penetrate and spread far and wide. The Apostle intimates that there is no reason why we should on this account be disturbed, for it is nothing new or unusual that the world, which is wholly fallacious, should readily hearken to what is false.

Footnotes

1 - The clause, "therefore speak they of the world," is hardly a true rendering, for ek never means "of," in the sense of "concerning." Macknight renders it "from." Grotius paraphrases the sentence thus, "They preach things agreeable to the dispositions of the world;" and Doddridge thus, "They speak as of the world, as taking their instructions from it." But ek, like ex in Latin, means sometimes "according to," as in Matthew 12:37, "For by (or, according to) thy words thou shalt be justified." See also verse 34, "but of (or, according to) the abundance," etc. Then this sentence may be thus rendered, "Therefore speak they according to the world:" that is, according to the views and principles of the superstitious and ungodly men of the world. -- Ed

They are of the world - This was one of the marks by which those who had the spirit of antichrist might be known. They belonged not to the church of God, but to the world. They had its spirit; they acted on its principles; they lived for it. Compare the notes at 1-John 2:15.
Therefore speak they of the world - Compare the notes at John 3:31. This may mean either that their conversation pertained to the things of this world, or that they were wholly influenced by the love of the world, and not by the Spirit of God, in the doctrines which they taught. The general sense is, that they had no higher ends and aims than they have who are influenced only by worldly plans and expectations. It is not difficult to distinguish, even among professed Christians and Christian teachers, those who are heavenly in their conversation from those who are influenced solely by the spirit of the world. "Out of the abundance of the heart the mouth speaketh," and the general turn of a man's conversation will show what "spirit is within him."
And the world heareth them - The people of the world - the frivoulous ones, the rich, the proud, the ambitious, the sensual - receive their instructions, and recognize them as teachers and guides, for their views accord with their own. See the notes at John 15:19. A professedly religious teacher may always determine much about himself by knowing what class of people are pleased with him. A professed Christian of any station in life may determine much about his evidences of piety, by asking himself what kind of persons desire his friendship, and wish him for a companion.

(4) They are of the world: therefore speak they of the world, and the world heareth them.
(4) He brings a reason why the world receives these teachers more willingly than the true: that is, because they speak nothing but that which is worldly: which is another note also to know the doctrine of antichrist by.

They are of the world,.... That is, the false prophets and teachers that were gone into the world, and had the spirit of antichrist in them; these were as they were when they came into the world, under the pollution, guilt, and dominion of sin, in a state of unregeneracy, carnality, and darkness; they properly belonged unto it, and walked after the course of it, and were under the influence of the god of it, who led them into error; and were sensual, and indulged themselves in worldly lusts, and were seeking after worldly things; supposed that gain was godliness, and had men's persons in admiration because of advantage; their nature and disposition, their principles and practices, and their ends and views, were worldly; and were quite different from Christ and his apostles, John 17:14,
therefore speak they of the world; they speak the wisdom of the world, or that in which the world thinks wisdom lies, and cry up for true knowledge, and right principles; and this they do with the enticing words of man's wisdom, or in words which man's wisdom teacheth; speaking great swelling words of vanity, which take with vain and carnal minds; and preach doctrines suited to their own taste, and the taste of others, as carnal and worldly men; such as the purity of human nature, in its first conception and birth, its freedom from any original corruption, and from any concern with the sin of Adam, only with actual sin of its own; and the power of it to do that which is good, keep the law of God, and obtain his favour; the non-necessity of any internal work of efficacious grace, a reformation of life and manners being thought sufficient to render a man acceptable to God, and prepare him for eternal happiness; the doctrine of justification and salvation by works; all which are pleasing to carnal men: hence it follows,
and the world heareth them; the wicked of the world; worldly and unregenerate men attend on their ministry, approve of what they deliver, and receive it with pleasure, and believe it: this expresses both the quality of the hearers of false teachers, that they are that part of the world, the worse part of it, which lies in wickedness; and the quantity of them, the greater part of the world, as it was foretold by Christ, and his apostles, that they should deceive many, that many should follow their pernicious ways, and that they should draw many disciples after them; wherefore the numbers that attend such persons, as it need not be wondered at, since both preachers and hearers, and the doctrines preached and heard, are all alike, they are of the world, so it should not be stumbling to the people of God.

of the world--They derive their spirit and teaching from the world, "unregenerate human nature, ruled over and possessed by Satan, the prince of this world" [ALFORD].
speak they of the word--They draw the matter of their conversation from the life, opinions, and feelings of the world.
the world heareth them-- (John 15:18-19). The world loves its own.

They - Those false prophets. Are of the world - Of the number of those that know not God. Therefore speak they of the world - From the same principle, wisdom, spirit; and, of consequence, the world heareth them - With approbation.