That which we read of clay may be read, (as our margin tells us,) as clay; that is, while it was yet clay it was spoiled in the potter's hand, so as he did not think fit to go on with his design as to the form of the vessel, but made it into another form, such as he liked best.
Related Commentaries of Jeremiah 18:4
Jeremiah 18:4
4 And the vessel that he made of clayb was marred in the hand of the potter: so he made it again another vessel, as seemed good to the potter to make it.