II. The silencing of the prophet's fears by the good words, and comfortable words, with which the angel answered him, v. 6, 7. One of the seraphim immediately flew to him, to purify him, and so to pacify him. Note, God has strong consolations ready for holy mourners. Those that humble themselves in penitential shame and fear shall soon be encouraged and exalted; those that are struck down with the visions of God's glory shall soon be raised up again with the visits of his grace; he that tears will heal. Note, further, Angels are ministering spirits for the good of the saints, for their spiritual good. Here was one of the seraphim dismissed, for a time, from attending on the throne of God's glory, to be a messenger of his grace to a good man; and so well pleased was he with the office that he came flying to him. To our Lord Jesus himself, in his agony, there appeared an angel from heaven, strengthening him, Luke xxii. 43. Here is, 1. A comfortable sign given to the prophet of the purging away of his sin. The seraph brought a live coal from the altar, and touched his lips with it, not to hurt them, but to heal them—not to cauterize, but to cleanse them; for there were purifications by fire, as well as by water, and the filth of Jerusalem was purged by the spirit of burning, ch. iv. 4. The blessed Spirit works as fire, Matt. iii. 11. The seraph, being himself kindled with a divine fire, put life into the prophet, to make him also zealously affected; for the way to purge the lips from the uncleanness of sin is to fire the soul with the love of God. This live coal was taken from off the altar, either the altar of incense or that of burnt-offerings, for they had both of them fire burning on them continually. Nothing is powerful to cleanse and comfort the soul but what is taken from Christ's satisfaction and the intercession he ever lives to make in the virtue of that satisfaction. It must be a coal from his altar that must put life into us and be our peace; it will not be done with strange fire. 2. An explication of this sign: "Lo, this has touched thy lips, to assure thee of this, that thy iniquity is taken away and thy sin purged. The guilt of thy sin is removed by pardoning mercy, the guilt of thy tongue-sins. Thy corrupt disposition to sin is removed by renewing grace; and therefore nothing can hinder thee from being accepted with God as a worshipper, in concert with the holy angels, or from being employed for God as a messenger to the children of men." Those only who are thus purged from an evil conscience are prepared to serve the living God, Heb. ix. 14. The taking away of sin is necessary to our speaking with confidence and comfort either to God in prayer or from God in preaching; nor are any so fit to display to others the riches and power of gospel-grace as those who have themselves tasted the sweetness and felt the influence of that grace; and those shall have their sin taken away who complain of it as a burden and see themselves in danger of being undone by it.