Verse 1-7 — Amaziah began well, but did not go on so. It is not enough to do that which our pious predecessors did, merely to keep up the common usage, but we must do it as they did, from the same principle of faith and devotion, and with the same sincerity and resolution.
Verse 8-14 — For some time after the division of the kingdoms, Judah suffered much from the enmity of Israel. After Asa's time, it suffered more by the friendship of Israel, and by the alliance made with them. Now we meet with hostility between them again. How may a humble man smile to hear two proud and scornful men set their wits on work, to vilify and undervalue one another! Unholy success excites pride; pride excites contentions. The effects of pride in others, are insufferable to those who are proud themselves. These are the sources of trouble and sin in private life; but when they arise between princes, they become the misery of their whole kingdoms. Jehoash shows Amaziah the folly of his challenge; Thine heart has lifted thee up. The root of all sin is in the heart, thence it flows. It is not Providence, the event, the occasion, whatever it is, that makes men proud, secure, discontented, or the like, but their own hearts do it.
Verse 15-22 — Amaziah survived his conqueror fifteen years. He was slain by his own subjects. Azariah, or Uzziah, seems to have been very young when his father was slain. Though the years of his reign are reckoned from that event, he was not fully made king till eleven years afterwards.
Verse 23-29 — God raised up the prophet Jonah, and by him declared the purposes of his favour to Israel. It is a sign that God has not cast off his people, if he continues faithful ministers among them. Two reasons are given why God blessed them with those victories: 1. Because the distress was very great, which made them objects of his compassion. 2. Because the decree was not yet gone forth for their destruction. Many prophets there had been in Israel, but none left prophecies in writing till this age, and their prophecies are part of the Bible. Hosea began to prophesy in the reign of this Jeroboam. At the same time Amos prophesied; soon after Micah, then Isaiah, in the days of Ahaz and Hezekiah. Thus God, in the darkest and most degenerate ages of the church, raised up some to be burning and shining lights in it; to their own age, by their preaching and living, and a few by their writings, to reflect light upon us in the last times.