Jeremiah 32:8

He then says, that Hanameel his uncle’s son came, as Jehovah had spoken, that he came into the court of the prison, and that he spoke to him as God had foretold. As to the end of the verse, it may seem strange that the Prophet says, that he now knew that the word came from God: for if he before doubted, where would be the certainty as to the prophetic spirit? He had already received a vision; he ought to have embraced what he knew had been foretold to him from above, even without any hesitation: but it appears that he was in suspense and perplexity. It then seems an evidence of unbelief, that he did not put a full and all entire trust in God’s testimony, and was not fully persuaded as to the heavenly oracle, until he saw the whole thing really accomplished. But it is right to distinguish between the knowledge received from the revelation of the Spirit and experimental knowledge, as they say. The Prophet therefore did not then for the first time learn that God had spoken, but as he was confirmed in the certainty of his faith, and in the thing itself, there is no inconsistency; for nothing is taken away from the credit and authority of God’s word, when the reality and experience confirm us; and thus God often has a regard to the weakness of his people. Jeremiah then relied on God’s oracle, and was fully persuaded that he was directed from above to buy the field; but afterwards, when Hanameel came to him, the event was as it were the sealing of the vision: then the truth of God was more and more confirmed in the heart of the Prophet. This, as I have said, was experimental knowledge, which detracts nothing from the credibility of the word, but is rather a help and a comfort to human infirmity. In this sense it was that he said, that he now knew it; and thus he intended also to make others to believe the prophecy. For when the faithful compare a vision with its accomplishment, this consent and harmony, so to speak, avails not a little to confirm their faith, that as when in one part they hear that God had spoken, and when in another they see that what the Prophet had been taught was really fulfilled. (60)