Idolatry is making a good aspect of creation – marriage, mountains, business, and so on – into the ultimate source of security, identity, and power. And so false gods are a thorn. When we make something into an idol, it continually makes us miserable. If we fall short of it, or if we might fall short of it, it robs us of joy. If our children are our false god, when their lives are troubled, we will lose our joy; and even when their lives might become troubled (which is all the time!), we will worry, and lose our joy.
– Tim Keller