God is not jealous like an insecure employer who fears that his employees might get lured away by a better salary elsewhere. God’s jealousy is not the reflex of weakness or fear. Instead God is jealous like a powerful and merciful king who takes a peasant girl from a life of shame, forgives her, marries her, and gives her not the chores of a slave, but the privileges of a wife – a queen. His jealousy does not rise from fear or weakness but from a holy indignation at having His honor and power and mercy scorned by the faithlessness of a fickle spouse.
John Piper