Matthew 3:2

“Desert,” in Greek eremos, hence hermit. St. John the Baptist is praised by St. John Chrysostom, as a perfect model, and the prince of an Eremitical life. (Hom. i. in Mar. and hom. i. in J. Bap.) Several sectarists do not approve of what St. Chrysostom advances in favour of an ascetic life, and doing penance for past sins. (Bristow) — Do penance.[1] Beza would have it translated repent. We retain the ancient expression, consecrated in a manner by the use of the Church; especially since a true conversion comprehends not only a change of mind, and a new life, but also a sorrow for past offences, accompanied with self-denials, and some severities of a penitential life. — The kingdom of heaven, which many times signifies the present condition of Christ’s Church. (Witham) — In this and other places of holy writ, instead of “do penance,” Protestants give “repent ye;” but general use has rendered metanoia, by pœnitentia, or penance; and in this text, not any kind of penance, or grief for sins committed, but that which is joined with a desire of appeasing Him who has been offended by sin; and this also by some external signs and works. For as many as heard this metanoeite, obeyed the voice, received from him the baptism of penance, confessed their sins, and it was said to them: Bring forth fruit worthy of repentance, ver. 8. Therefore, all this was contained in the penance preached by the baptist. And here we must not omit, that while sectarists preach faith alone, both the baptist and Jesus Christ begin their ministry with practising and preaching penance. (Tirinus) — Pœnitentiam agite, metanoeite. Which word, according to the use of the Scriptures and the holy fathers, does not only signify repentance and amendment of life, but also punishing past sins by fasting, and such like penitential exercises. (Challoner)

1. The doctrine he preached was that of repentance (v. 2); Repent ye. He preached this in Judea, among those that were called Jews, and made a profession of religion; for even they needed repentance. He preached it, not in Jerusalem, but in the wilderness of Judea, among the plain country people; for even those who think themselves most out of the way of temptation, and furthest from the vanities and vices of the town, cannot wash their hands in innocency, but must do it in repentance. John Baptist's business was to call men to repent of their sins; Metanoeite—Bethink yourselves; "Admit a second thought, to correct the errors of the first—an afterthought. Consider your ways, change your minds; you have thought amiss; think again, and think aright." Note, True penitents have other thoughts of God and Christ, and sin and holiness, and this world and the other, than they have had, and stand otherwise affected toward them. The change of the mind produces a change of the way. Those who are truly sorry for what they have done amiss, will be careful to do so no more. This repentance is a necessary duty, in obedience to the command of God (Acts 17 30); and a necessary preparative and qualification for the comforts of the gospel of Christ. If the heart of man had continued upright and unstained, divine consolations might have been received without this painful operation preceding; but, being sinful, it must be first pained before it can be laid at ease, must labour before it can be at rest. The sore must be searched, or it cannot be cured. I wound and I heal.

Verses 1-6 After Malachi there was no prophet until John the Baptist came. He appeared first in the wilderness of Judea. This was not an uninhabited desert, but a part of the country not thickly peopled, nor much enclosed. No place is so remote as to shut us out from the visits of Divine grace. The doctrine he preached was repentance; "Repent ye." The word here used, implies a total alteration in the mind, a change in the judgment, disposition, and affections, another and a better bias of the soul. Consider your ways, change your minds: you have thought amiss; think again, and think aright. True penitents have other thoughts of God and Christ, sin and holiness, of this world and the other, than they had. The change of the mind produces a change of the way. That is gospel repentance, which flows from a sight of Christ, from a sense of his love, and from hopes of pardon and forgiveness through him. It is a great encouragement to us to repent; repent, for your sins shall be pardoned upon your repentance. Return to God in a way of duty, and he will, through Christ, return unto you in the way of mercy. It is still as necessary to repent and humble ourselves, to prepare the way of the Lord, as it then was. There is a great deal to be done, to make way for Christ into a soul, and nothing is more needful than the discovery of sin, and a conviction that we cannot be saved by our own righteousness. The way of sin and Satan is a crooked way; but to prepare a way for Christ, the paths must be made straight, ( Hebrews 12:13 ) . Those whose business it is to call others to mourn for sin, and to mortify it, ought themselves to live a serious life, a life of self-denial, and contempt of the world. By giving others this example, John made way for Christ. Many came to John's baptism, but…