Irenaeus Against Heresies Book I t to the disobedience of men; and set forth why it is that one and the same God has made some things temporal and some eternal, some heavenly and others earthly; and understand for what reason God, though invisible, manifested Himself to the prophets not under one form, but differently to different individuals; and show why it was that more covenants than one were given to mankind; and teach what was the special character of each of these covenants; and search out for what reason "God[138] Irenaeus Against Heresies Book III And therefore Paul declares, "For God hath concluded all in unbelief, that He may have mercy upon all; "[381]