2 Peter 2:20-22

Verse 20

The pollutions of the world - Sin in general, and particularly superstition, idolatry, and lasciviousness. These are called μιασματα, miasmata, things that infect, pollute, and defile. The word was anciently used, and is in use at the present day, to express those noxious particles of effluvia proceeding from persons infected with contagious and dangerous diseases; or from dead and corrupt bodies, stagnant and putrid waters, marshes etc., by which the sound and healthy may be infected and destroyed. The world is here represented as one large, putrid marsh, or corrupt body, sending off its destructive miasmata everywhere and in every direction, so that none can escape its contagion, and none can be healed of the great epidemic disease of sin, but by the mighty power and skill of God. St. Augustine has improved on this image: "The whole world," says he, "is one great diseased man, lying extended from east to west, and from north to south; and to heal this great sick man, the almighty Physician descended from heaven." Now, it is by the knowledge of the Lord and Savior Jesus Christ, as says St. Peter, that we escape the destructive influence of these contagious miasmata. But if, after having been healed, and escaped the death to which we were exposed, we get again entangled, εμπλακεντες, enfolded, enveloped with them; then the latter end will be worse than the beginning: forasmuch as we shall have sinned against more light, and the soul, by its conversion to God, having had all its powers and faculties greatly improved, is now, being repolluted, more capable of iniquity than before, and can bear more expressively the image of the earthly.
Verse 21

For it had been better for them not to have known - For the reasons assigned above; because they have sinned against more mercy, are capable of more sin, and are liable to greater punishment.

The holy commandment - The whole religion of Christ is contained in this one commandment, "Thou shalt love the Lord thy God with all thy heart, with all thy soul, with all thy mind, and with all thy strength; and thy neighbor as thyself." He who obeys this great commandment, and this by the grace of Christ is possible to every man, is saved from sinning either against his God or against his neighbor. Nothing less than this does the religion of Christ require.
Verse 22

According to the true proverb - This seems to be a reference to Pro 26:11 : ככלב שב אל קאו kekeleb shab al keo; as the dog returneth to his vomit, so a fool repeateth his folly. In substance this proverb is found among the rabbins; so Midrash Ruth, in Sohar Chadash, fol. 62: Orphah is returned to her mire, Ruth persevered in spirit; and again, Ibid. fol. 64: "Orphah, which is נפש הבהמית nephesh habbehemith, the bestial soul, is returned to her mire."

The Greeks have something like it; so Arrian, Dissert. Epict. l. iv. c. 11, says: Απελθε και χοιρῳ διαλεγου, ἱν' εν βορβορῳ μη κυλιηται, "Go and reason with the swine, lest he be rolled in the mire." This is called a true proverb: for it is a fact that a dog will eat up his own vomit; and the swine, howsoever carefully washed, will again wallow in the mire. As applied here it is very expressive: the poor sinner, having heard the Gospel of Christ, was led to loathe and reject his sin; and, on his application to God for mercy, was washed from his unrighteousness. But he is here represented as taking up again what he had before rejected, and defiling himself in that from which he had been cleansed.

Here is a sad proof of the possibility of falling from grace, and from very high degrees of it too. These had escaped from the contagion that was in the world; they had had true repentance, and cast up "their soursweet morsel of sin;" they had been washed from all their filthiness, and this must have been through the blood of the Lamb; yet, after all, they went back, got entangled with their old sins, swallowed down their formerly rejected lusts, and rewallowed in the mire of corruption. It is no wonder that God should say, the latter end is worse with them than the beginning: reason and nature say it must be so; and Divine justice says it ought to be so; and the person himself must confess that it is right that it should be so. But how dreadful is this state! How dangerous when the person has abandoned himself to his old sins! Yet it is not said that it is impossible for him to return to his Maker; though his case be deplorable, it is not utterly hopeless; the leper may yet be made clean, and the dead may be raised. Reader, is thy backsliding a grief and burden to thee? Then thou art not far from the kingdom of God; believe on the Lord Jesus, and thou shalt be saved.

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