If money is all that a man makes, then he will be poor — poor in happiness, poor in all that makes life worth living.
Casson strikes at something harder than the simple "money can't buy happiness" platitude—he's describing a specific kind of poverty that wealth creates in those who pursue it exclusively. The insight cuts deeper because it suggests that single-minded accumulation doesn't just fail to deliver fulfillment; it actively *produces* a deficit, a hollowing out. Watch a successful person at sixty who's neglected friendships, curiosity, and service realize that their bank account has grown while their capacity for joy has atrophied, and you'll see Casson's warning made flesh.