Scripture is crystal-clear that one should NOT “divorce their spouse and remarry” unless their spouse is guilty of adultery. Let’s read Matthew 19:1-9, “Now it came to pass, when Jesus had finished these sayings, that He departed from Galilee and came to the region of Judea beyond the Jordan. And great multitudes followed Him, and He healed them there. The Pharisees also came to Him, TESTING HIM, and saying to Him, ‘Is it lawful for a man to divorce his wife FOR JUST ANY REASON?’ And He answered and said to them, ‘Have you not read that He who made them at the beginning ‘made them male and female,’ and said, ‘For this reason a man shall leave his father and mother and be joined to his wife, and the two shall become one flesh’? So then, they are no longer two but one flesh. Therefore what God has joined together, LET NOT MAN SEPARATE.’ They said to Him, ‘Why then did Moses command to give a certificate of divorce, and to put her away?’ He said to them, ‘Moses, BECAUSE OF THE HARDNESS OF YOUR HEARTS, permitted you to divorce your wives, but from the beginning it was not so. And I say to you, whoever divorces his wife, EXCEPT FOR SEXUAL IMMORALITY, and marries another, commits adultery; and whoever marries her who is divorced commits adultery.’”

One cannot read this passage and then teach that one can divorce their spouse “for any reason” other than “sexual immorality.” You mentioned two possible reasons: 1) getting mad (I assume you either meant the spouse has a big problem with ANGER or they go MAD IN THEIR MINDS due to a mental illness like Alzheimer’s Disease or Dementia), or 2) suffering from a terrible sickness for a long period. Though these “reasons” present a real TRIAL for the other spouse, they also provide the opportunity for them to show love and patience to their failing spouse. We often hear at a wedding the couple giving their vows to one another and they include the words “for better or WORSE, till death do us part.” Those words, if said in sincerity, imply that no matter what happens to a spouse, we are committing ourselves to them till death comes in to end the marriage.

We read in Malachi 2:16, “For the LORD God of Israel says that He hates divorce.” God has not changed His mind; He still hates divorce and I am sure He is saddened to see the rate of divorce today (even among true believers in Christ), and in many cases it is “for any reason.” When a true believer divorces their spouse “for any reason other than sexual immorality” it reveals the condition of their heart. The Lord Jesus told the Pharisees that Mose permitted it in his day because of “the HARDNESS of their hearts” and such is the case today if believers refuse to honor and obey God’s command to remain married unless their spouse is guilty of adultery. If one disobeys God’s will and remarries, they, and the one who they marry, are both guilty of adultery. And shame on anyone who may be “advising one to divorce their spouse and marry another for any reason.”  (DO)  (677.3)