Charles Ellicott Commentary Jeremiah 20:11

"But Jehovah is with me as a mighty one [and] a terrible: therefore my persecutors shall stumble, and they shall not prevail; they shall be utterly put to shame, because they have not dealt wisely, even with an everlasting dishonor which shall never be forgotten." — Jeremiah 20:11 (ASV)

But the Lord is with me. — As in Psalm 22:0 and other similar utterances, the prophet, though perplexed, is still not in despair (2 Corinthians 4:8). He passes through the deep waters but struggles out of them to the rock of refuge. The word “terrible” was used with a special significance. Jehovah had promised to deliver the prophet from the “terrible” ones (Jeremiah 15:21). He, the mighty God (Isaiah 9:6), would now show that He was more terrible than the prophet’s foes, that it was better to come under their wrath than His (Isaiah 8:12–13).

For they shall not prosper. — Better, because they have not dealt wisely. The word is the same as in Jeremiah 10:21, where see the note.

Their everlasting confusion. — Better, as carrying on the structure of the previous clause, with an everlasting confusion that shall never be forgotten.