We can be content with simplicity because the deepest most satisfying delights God gives us through creation are free gifts from nature and from loving relationships with people. After your basic needs are met, accumulated money begins to diminish your capacity for these pleasures rather than increase them. Buying things contributes absolutely nothing to the heart's capacity for joy.

Desiring God, Revised Edition: Meditations of a Christian Hedonist (ed. Multnomah, 2011) - ISBN: 9781601423917