Avoid the occasions of sin, and the least appearance of evil: We must shun and be shy of the very show and shadow of sin, and every savor or suspicion of sin.

Abstain from all appearance of evil.

1 Thess 5:22

Epiphanius says that in the old law, when any dead body was carried by any house, they were enjoined to shut their doors and windows. Theodosius tore the Arian’s arguments presented to him in writing, because he found them repugnant to the Scriptures. Augustine retracted even ironies, because they had the appearance of lying.

When God had commanded the Jews to abstain from swine’s flesh, they would not so much as name it—but in their common talk would call a sow another thing. To abstain from all appearance of evil, is to do nothing wherein sin appears, or which has a shadow of sin. Bernard ‘Abstained from whatever is of evil show, or of ill report, that he may neither wound conscience nor credit.’ We must shun and be shy of the very show and shadow of sin, if either we have a regard to our credit abroad, or our comfort at home.

It was good counsel that Livia gave her husband Augustus: ‘It behooves you not only not to do wrong—but not to seem to do so.’ So Jude 23, ‘And others save with fear, pulling them out of the fire, hating even the garment spotted by the flesh.’ It is a phrase taken from legal uncleanness, which was contracted by touching the houses, the vessels, the garments, of unclean people. Under the law, men might not touch a menstruous cloth, nor would God accept of a blemished peace-offering. So we must not only hate and avoid gross sins—but everything that may carry a savor or suspicion of sin; we must abhor the very signs and tokens of sin. So in Prov. 5: 8, ‘Remove your way far from her, and come not near the door of her house.’

To venture upon the occasion of sin, and then to pray, ‘Lead us not into temptation,’ is all one as to thrust your finger into the fire, and then to pray that it might not be burnt. So, in Prov. 4: 14, 15, you have another command: ‘Enter not into the path of the wicked, and go not in the way of evil men: avoid it, pass not by it, turn from it, and pass away.’ This triple gradation of Solomon shows with a great emphasis, how necessary it is for men to flee from all appearance of sin, as the seaman shuns rocks and shelves; and as men shun those who have the plague-sores running upon them. As weeds endanger the corn, as an infection endangers the blood, or as an infected house endanger the neighborhood; so does the company of the wicked endanger the godly. Friendship with wicked consorts is one of the strongest chains of hell, and binds us to a participation in both their sin and their punishment.

It is impossible for that man to get the conquest of sin—who plays and sports with the occasions of sin. God will not remove the temptation to sin, except you turn from the occasion of sin. It is a just and righteous thing with God, that he should fall into the pit, who will adventure to dance upon the brink of the pit, and that he should be a slave to sin, that will not flee from the occasions of sin. As long as there is fuel in our hearts for a temptation, we cannot be secure. He who has gunpowder about him had need keep far enough off from sparks. To rush upon the occasions of sin is both to tempt ourselves, and to tempt Satan to tempt our souls! It is very rare that any soul plays with the occasions of sin—but that soul is then ensnared by sin!

The fable says, that the butterfly asked the owl how she should deal with the fire which had singed her wings, who counseled her not to behold so much as its smoke.

It is seldom that God keeps that soul from the acts of sin, who will not keep off from the occasions of sin. He who adventures upon the occasions of sin, is as he who would quench the fire with gasoline. Ah, souls, often remember how frequently you have been overcome by sin, when you have boldly gone upon the occasions of sin! Look back, souls, to the days of your vanity, wherein you have been as easily conquered as tempted, vanquished as assaulted—when you have played with the occasions of sin. As you would for the future be kept from the acting of sin, and be made victorious over sin, oh! flee from the occasions of sin!

Thomas Brooks.  Precious Remedies Against Satan’s Devices.