Jeremiah 1:9

By stretching out His hand and touching Jeremiah’s mouth, the Lord symbolized the transfer of His words to the prophet’s mouth (cf. Deuteronomy 18:18). He also explained the meaning of His act. This was a powerful way of visualizing that the Lord Himself would participate in all that Jeremiah would undertake (cf. Isaiah 6:6-7; Ezekiel 3:1-3).

God uses ordinary people to accomplish His extraordinary work if they trust in Him in spite of their fears, obey Him in spite of their inexperience, and proclaim His Word in spite of their feelings of inadequacy. [Note: Charles H. Dyer, in The Old Testament Explorer, p. 591.]

"The word of God is a power that carries out His will, and accomplishes that whereto He sends it, Isa. Leviticus 10 ff. Against this power nothing earthly can stand; it is a hammer that breaks rocks in pieces, xxiii. 29." [Note: Keil, 1:42.]