John Calvin's Bible Commentary
Jeremiah 43:2
Now he says, that when he had finished speaking to the whole people, as God had commanded, then John the son of Kareah, and Azariah the son of Hoshaiah, being the first among them, spoke against him. As to Azariah, we cannot know with any certainty what he was. But we have here in John the son of Kareah an example deserving of notice. We have seen that he was a bold, wise, and prudent man, and also of an upright mind. In short, when we consider what the Prophet has before said of him, we cannot but think he was by nature a heroic man; nay, when he is compared with Gedaliah, who, at the same time, was an excellent man, and whom the Prophet has adorned with high commendations, he yet far excelled him. Gedaliah, indeed, had a kind disposition, he was courageous in protecting the people, he was a man of integrity; and, besides, he was a father to the people, and so conducted himself when things were in a hopeless state, that, beyond the expectation of all, he gathered together the remnant of the people; and we have also seen that by his efforts the Prophet had been delivered from instant death. But John the son of Kareah had been a remarkable helper to him, having come to him of his own accord, and offered to him his assistance; and further, he faithfully and prudently warned him to beware of the perfidy of that unprincipled man, by whom he was afterwards killed. Gedaliah fell through extreme credulity. John, then, the son of Kareah, had a greater appearance of excellency than Gedaliah had exhibited. But what does the Spirit of God now declare respecting him and his associates? They are said to have been proud and obstinate. We hence see that some men excel in greatness of mind, and are yet of a refractory disposition; and this is for the most part the case during’ a disturbed state of things. For some come forth wonderfully courageous; but when things do not fall in with their wishes, they become ferocious and rebel against God and men, and besides, they will never bear to be brought under submission. Such, then, was John the son of Kareah: at one time he manifested extraordinary virtue, but at length it appeared what he really was.
The Prophet, with the authority of a judge, declares that he and his associates were proud: then Azariah the son of Hoshaiah, and John the son of Kareah, and all the proud men, said, A falsehood dost thou speak. This was extremely insolent and reproachful; for they had lately testified that they regarded Jeremiah as God’s faithful servant, and that they would receive whatever he might bring as God’s true oracle; but now they charge him with falsehood! how great was this presumption! But it hence appears how deep and various, and how tortuous are the recesses which are in the hearts of men; for at one time they announce honied words, and afterwards they utter nothing’ but virulence. So from the same mouth, as it were, almost in the same moment, comes forth what is sweet; and what is bitter.
Let us hence learn that the heart of man is full of every kind of deceit, until it be cleansed by the Spirit of God. We also see, when once impiety boils up, to what extremes it will proceed; for these men were not only insolent and reproachful towards Jeremiah, but also towards God himself. And they did not now make evasions as before, nor did they raise objections; but they openly raved against the Prophet. Thus hypocrisy has indeed for a time its coverings, but when the ungodly are urged by God, then they observe no bounds: Thou speakest what is false