Central to the meaning that Jeremiah wants to get across is the idea of turning, of repentance. When the potter finds that what he’s making is ruined, he “turns” or “repents” and makes something different. The call that God issues to the Israelites is a call to repentance, a call for them to turn from their evil ways, and if they will turn then God promises that He will also turn from the course of judgment that He has set. It’s a call to a radical change, and the piece of pottery that will emerge afterwards will be different from the one that might have been possible before it was ruined. Different, but not worse. The skill of this Potter are such that the remade vessel is never second-best, but always simply best.