On How to Glorify a Mountain Spring

From John Piper's The Pleasures of God:

God has no needs that I could ever be required to satisfy. God has no deficiencies that I might be required to supply. He is complete in himself. He is overflowing with happiness in the fellowship of the Trinity. The upshot of this is that God is a mountain spring, not a watering trough. A mountain spring is self-replenishing. It constantly overflows and supplies others. But a watering trough needs to be filled with a pump or a bucket brigade. So if you want to glorify the worth of a watering trough you work hard to keep it full and useful. If you want to glorify the worth of a spring you do it by getting down on your hands and knees and drinking to your heart's satisfaction, until you have the refreshment and strength to go back down in the valley and tell people what you've found.