Your flight is a good one if your heart does not act out the counsels of sinners and their designs. Your flight is a good one if your eye flees the sight of cups and drinking vessels, so that it may not become envious as it lingers over the wine. Your flight is good if your eye turns away from the woman stranger, so that your tongue may keep the truth. Your flight is a good one if you do not answer the fool according to his folly. Your flight is good if you direct your footsteps away from the countenance of fools. Indeed, one swiftly goes astray with bad guides; but if you wish your flight to be a good one, remove your ways far from their words.
Keep your way far from her, etc. And the apostle says, Flee fornication (1 Corinthians 6). Because indeed the first remedy of this vice is to be far from those whose presence either allures or cooperates in the vice. But it also benefits weak listeners to be entirely separated from the hearing of heretics.
[AD 397] Ambrose of Milan on Proverbs 5:8