In his book The Weight of Glory, C. S. Lewis notes how believers often underestimate the full riches God has for His children.

…If we consider…the staggering nature of the rewards promised in the Gospels, it would seem that our Lord finds our desires, not too strong, but too weak. We are half-hearted creatures…like an ignorant child who wants to go on making mud pies in a slum because he cannot imagine what is meant by the offer of a holiday at the sea. We are far too easily pleased.

In Touch, June 29, 1993,