The prophet, having shown their base ingratitude in forsaking God, here shows their unparalleled fickleness and folly (v. 9): I will yet plead with you. Note, Before God punishes sinners he pleads with them, to bring them to repentance. Note, further, When much has been said of the evil of sin, still there is more to be said; when one article of the charge is made good, there is another to be urged; when we have said a great deal, still we have yet to speak on God's behalf, Job xxxvi. 2. Those that deal with sinners, for their conviction, must urge a variety of arguments and follow their blow. God had before pleaded with their fathers, and asked why they walked after vanity and became vain, v. 5. Now he pleads with those who persisted in that vain conversation received by tradition from their fathers, and with their children's children, that is, with all that in every age tread in their steps. Let those that forsake God know that he is willing to argue the case fairly with them, that he may be justified when he speaks. He pleads that with us which we should plead with ourselves.