Jeremiah 1:9

Here Jeremiah speaks again of his calling, that his doctrine might not be despised, as though it proceeded from a private individual. He, therefore, testifies again, that he came not of himself, but was sent from above, and was invested with the authority of a prophet. For this purpose he says, that God’s words were put in his mouth.

This passage ought to be carefully observed; for Jeremiah briefly describes how a true call may be ascertained, when any one undertakes the office of a teacher in the Church: it is ascertained even by this when he brings nothing of his own, according to what Peter says in his first canonical epistle,

“Let him who speaks, speak as the oracles of God,”
(1 Peter 4:11)

that is, let him not speak doubtingly, as though he introduced his own glosses; but let him boldly, and without hesitation, speak in the name of God. So also Jeremiah in this place, in order that he might demand to be heard, plainly declares that the words of God were put in his mouth. Let us, then, know, that whatever proceeds from the wit of man, ought to be disregarded; for God wills this honor to be conceded to him alone, as it was stated yesterday, to be heard in his own Church. It hence follows, that none ought to be acknowledged as God’s servants, that no prophets or teachers ought to be counted true and faithful, except those through whom God speaks, who invent nothing themselves, who teach not according to their own fancies, but faithfully deliver what God has committed to them.

A visible symbol was added, that there might be a stronger confirmation: but there is no reason to make this a general rule, as though it were necessary that the tongues of all teachers should be touched by the hand of God. There are here two things — the thing itself, and the external sign. As to the thing itself, a rule is prescribed to all God’s servants, that they bring not their own inventions, but simply deliver, as from hand to hand, what they have received from God. But it was a special thing as to Jeremiah, that God, by stretching out his hand, touched his mouth; it was, that he might openly shew that his mouth was consecrated to himself. It is therefore sufficient as to the ministers of the word, that their tongues be consecrated to God, so that they may not mix any of their own fictions with his pure doctrine. But it was God’s will, as to Jeremiah, to add also the visible signs of the thing itself, by extending his hand and touching his mouth.