The marital relationship may be the best way to help us understand the difference between sinful jealousy and righteous jealousy. I can be jealous over my relationship with my wife in a wrong way or in a right way. For example, if I feel resentment or anger merely because I see her talking to another man, that would be self-centered possessiveness and unreasonable domination – in other words, sinful jealousy. It would stem from my own selfishness or insecurity rather than from my commitment to her and to what is right. But, on the other hand, if I see some man actually trying to alienate my wife’s affections and seduce her, then I have reason to be righteously jealous. God gave her to me to be my wife. Her body is mine just as my body is hers. I have the exclusive right to enjoy her fully, and for someone else to assume that right would be a violation of God’s holy standards. I am zealous for the exclusiveness and purity of our marriage, and that is a righteous jealousy.
Richard Strauss