Under Gods Command
Malachi 2:15-16 Has not the LORD made them one? In flesh and spirit they are his. And why one? Because he was seeking godly offspring. So guard your self in your spirit, and do not break faith with the wife of your youth.
“Guard yourself in your spirit, and do not break faith” means to have the same commitment to marriage that God has to his promises with his people.
Lets Bring it Home: We need passion in the marriage relationship to keep the commitment and intimacy satisfying, but this passion should be focused exclusively on our spouse.
Under Gods command 