James 4:5

God is jealous of us. We may do different things like go and be friends with the world. However, choosing to give our best and primary efforts towards things other than God is bad. This results in not putting God first. This kind of thing is bad and we end up not giving God our all. As a result, God is jealous of the praise he rightfully deserves. God is a jealous God, and it may seem like a bad thing. Jealousy is certainly a bad thing for us, but it isn't the same for God. When we are jealous, we are jealous for that which we do not deserve. However, God is worthy and is jealous for that which he deserves. Perhaps it's like a husband who is jealous for the love of his wife. They are to love one another, are they not? That kind of jealousy would not be wrong, would it? Sure, maybe you can think up some exceptions, but for the most part it wouldn't be wrong. God yearns jealously over us. More specifically, it is the spirit dwelling in us. Not only that, but this spirit was made to dwell in us because of God. Either way, we are not to go after the world and befriend them, leaving God in the dust.