Adam Clarke on Jeremiah 18:2

Go down to the potter's house - By this similitude God shows the absolute state of dependence on himself in which he has placed mankind. They are as clay in the hands of the potter; and in reference to every thing here below, he can shape their destinies as he pleases. Again; though while under the providential care of God they may go morally astray, and pervert themselves, yet they can be reclaimed by the almighty and all-wise Operator, and become such vessels as seemeth good for him to make. In considering this parable we must take heed that in running parallels we do not destroy the free agency of man, nor disgrace the goodness and supremacy of God.