I. In the end of the former chapter there is mention made of holy men of God, who lived in the times of the Old Testament, and were used as the amanuenses of the Holy Ghost, in writing the sacred oracles; but in the beginning of this he tells us they had, even at that time, false prophets in the church as well as true. In all ages of the church, and under all dispensations, when God sends true prophets, the devil sends some to seduce and deceive, false prophets in the Old Testament, and false Christs, false apostles, and seducing teachers, in the New. Concerning these observe, 1. Their business is to bring in destructive errors, even damnable heresies, as the business of teachers sent of God is to show the way of truth, even the true way to everlasting life. There are damnable heresies as well as damnable practices; and false teachers are industrious to spread pernicious errors. 2. Damnable heresies are commonly brought in privily, under the cloak and colour of truth. Those who introduce destructive heresies deny the Lord that bought them. They reject and refuse to hear and learn of the great teacher sent from God, though he is the only Saviour and Redeemer of men, who paid a price sufficient to redeem as many worlds of sinners as there are sinners in the world. 4. Those who bring in errors destructive to others bring swift (and therefore sure) destruction upon themselves. Self-destroyers are soon destroyed; and those who are so hardened as to propagate errors destructive to others shall surely and suddenly be destroyed, and that without remedy.
II. He proceeds, in the second verse, to tell us the consequence with respect to others; and here we may learn, 1. Corrupt leaders seldom fail of many to follow them; though the way of error is a pernicious way, yet many are ready to walk therein. Men drink in iniquity like water, and are pleased to live in error. The prophets prophesy falsely, and the people love to have it so. 2. The spreading of error will bring up an evil report on the way of truth; that is, the way of salvation by Jesus Christ, who is the way, the truth, and the life. The Christian religion is from the God of truth as the author, leads to true happiness in the enjoyment of the true God as the end, and works truth in the inward part as the means of acceptably serving God. And yet this way of truth is traduced and blasphemed by those who embrace and advance destructive errors. This the apostle has foretold as what should certainly come to pass. Let us not be offended at any thing of this in our day, but take care that we give no occasion to the enemy to blaspheme the holy name whereby we are called, or speak evil of that way whereby we hope to be saved.
III. Observe, in the next place, the method seducers take to draw disciples after them: they use feigned words; they flatter, and by good words and fair speeches deceive the hearts of the simple, inducing them to yield entirely to the opinions which these seducers endeavour to propagate, and sell and deliver themselves over to the instruction and government of these false teacher, who make a gain of those whom they make their proselytes, serving themselves and making some advantage of them; for all this is through covetousness, with a desire and design to get more wealth, or credit, or commendation, by increasing the number of their followers. The faithful ministers of Christ, who show men the way of truth, desire the profit and advantage of their followers, that they may be saved; but these seducing teachers desire and design only their own temporal advantage and worldly grandeur.