“The idols of the nations are…the work of human hands. They have eyes but do not see…. Those who make them become like them, so do all who trust in them!” (Ps. 135:15-18). Make and trust a blind idol, and you become blind. Apply that principle to the modern world, and think of the idols of our own day. What do we make and what do we trust? Things. Toys. Technology. And so our hearts and our affections are formed by these things. They compress the void in our heart into shapes like toys. The result is that we are easily moved and excited by things—computers, cars, appliances, entertainment media. They seem to fit the shapes in our hearts. They feel good in the tiny spaces they have made. But in this readiness to receive pleasure from things, we are ill-shaped for Christ. He seems unreal, unattractive. The eyes of our hearts grow dull.
—John Piper, When I Don’t Desire God, p. 58