Shall not God search this out?.... Undoubtedly he would, was it so, and expose it, and punish for it; as he will the Balaamites and children of Jezebel, Rev 2:18; this seems to be an appeal to God for the truth of all that the church had said concerning her steadfastness and integrity under the most trying exercises; for he knoweth the secrets of the heart; whether the heart is turned back, or there is any inclination to apostatize from God, or his name is forgotten in it; as well as whether in fact the hand has been stretched out, or prayer made to a strange god, Jer 17:9.