Mosaic laws about divorce are at least one example of where God allowed waivers from the absolutes so as to continue to build and strengthen the overall faith and obedience of his people.
Where does that leave us today? Are there still places where God would allow a waiver in order to continue to draw us closer to him?
No. As the revered Fr John A Hardon, S.J. comments: “Since the Mosaic code allowed divorce and remarriage and even polygamy, adultery in the Old Testament was essentially a sin against justice….intercourse with someone else than one’s spouse was an act of injustice toward the married partner.”
“Christ raised the commandment to hitherto unknown heights.” The Catholic Catechism, Doubleday, 1975, p 372].
Matthew 5:27-30 New Revised Standard Version Catholic Edition
27 “You have heard that it was said, ‘You shall not commit adultery.’ 28 But I say to you that everyone who looks at a woman with lust has already committed adultery with her in his heart. 29 If your right eye causes you to sin, tear it out and throw it away; it is better for you to lose one of your members than for your whole body to be thrown into hell.[a] 30 And if your right hand causes you to sin, cut it off and throw it away; it is better for you to lose one of your members than for your whole body to go into hell.
There are no “waivers” as envisaged, and the love that draws us closer to Him is that embodied in “If you love Me, keep My Commandments.” The CCC covers “Erroneous Judgment” in 1790-1794.