Then does election remain sure?
It does. And rejection remains also. But listen. If Esau had died an infant he would doubtless have been elect. For if he had died then there would have been the seal of election, for the Lord would not have rejected him eternally. But since he lived and was of the non-elect, he so lived that we see in the fruit of his unfaith that he was rejected by the Lord.
(Quoted by Peter Lillback, The Binding of God, p. 105).