John Trapp on Jeremiah 1:2

Ver. 2. Ʋnto whom the Word of the Lord came in the dayes of Joſiah] Woe be to the world becauſe of the Word. The Lord keepeth count what Preachers he ſendeth, what pains they take, and how long, to how little purpoſe they preach unto a people. He ſaith that it was the Word of the Lord, for authority ſake, and that none might deſpiſe his youth, ſith he was ſent by the Ancient of dayes.

In the thirteenth year of his reigne] Eighteen years then he prophecyed under good Joſiah, who was too blame, doubtleſſe, in not ſending to adviſe with this or ſome other Prophet, before he went forth againſt Pharaoh-Necho: ſometimes both grace and wit are aſleep in the holieſt and warieſt breaſts.