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.
John PiperWhenever your heart starts to be anxious about the future, preach to your heart and say, 'Heart, who do you think you are to be afraid of the future and nullify the promise of God? No, heart, I will not exalt myself with anxiety. I will humble myself in peace and joy as I trust this precious and great promise of God - He cares for me.'
John PiperIf you can't see the sun you will be impressed with a street light. If you've never felt thunder and lightning you'll be impressed with fireworks. And if you turn your back on the greatness and majesty of God you'll fall in love with a world of shadows and short-lived pleasures.
John Piper