Douglas Wilson, pastor in Moscow, Idaho, explains good jealousy in his marriage book, For a Glory and a Covering:
"Godly jealousy is not really about making particular
accusations—jealousy builds a fence but does not make assertions about the
individuals who don’t know why you put the fence there. You can lock your doors at night without
accusing every person who walks by of attempted thievery, and you can pull back
when someone crosses your “friendly line” without accusing that person of
“attempted adultery.” Godly jealousy
sets particular standards—for friendships, for get-togethers, for business
lunches, for entertainment standards, for dress, and so on. Many fathers, for example, are not nearly
jealous enough when it comes to how their daughters dress. And they might be surprised at how much it
costs to have a daughter look that cheap….
"A man or woman should be jealous over things like sexual infidelity,
emotional flirtation, significant amounts of time spent elsewhere when it
should be spent at home, money squandered when it should be invested in the
home, and so forth."