John Trapp on Isaiah 41:23

Ver. 23. Shew the things that are to come] This firſt argument is much inſiſted on: God alone can properly predict;Tertul. Apol. cap. 20. and Teſtimonium divinitatis eſt veritas divinationis. Cato Major was wont to ſay, that he wondered how one Diviner could look upon another and not laugh, as knowing themſelves to be no better then deceivers of the people.

Yea do good or evil] good to your friends, evil to your foes: this is the ſecond argument, and it is unanſwerable. If it be objected, that this the Devil can do, and hath done: The anſwer is, 1. that Idols can do neither good nor evil. 2. No nor yet Devils: but the good they do their clients, is a meer juggle: and the evil they do to any, is by divine permiſſion.Vide etiam Aug. de Civ. Dei. l. 2. c. 22. 25. & Baruc. 6. See Cyprians fourth treatiſe de vanitate idolorum.