"We are Half-Hearted Creatures"

I am reading C. S. Lewis' The Weight of Glory, from which this keen quote is derived:

"We are half-hearted creatures, fooling about with drink and sex and ambition when infinite joy is offered us, 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." C.S. Lewis, The Weight of Glory