http://www.stevekmccoy.com/reformissionary/2011/06/tim-keller-wisdom-and-sabbath-rest.html

The purpose of Sabbath is not simply to rejuvenate yourself in order to do more production, nor is it the pursuit of pleasure. The purpose of Sabbath is to enjoy your God, life in general, what you have accomplished in the world through his help, and the freedom you have in the gospel—the freedom from slavery toany material object or human expectation. The Sabbath is a sign of the hope that we have in the world to come.

and from viv: http://vivmabuni.wordpress.com/2011/06/29/compost-redemption/

When we grow, in contrast to merely change, we venture into new territory and include more people in our lives–serve more and love more. Our culture is filled with change; it’s poor in growth. New things, models, developments, opportunities are announced, breathlessly, every hour. But instead of becoming ingredients in a long and wise growth, they simply replace. The previous is discarded and the immediate stuck in until, bored by the novelty, we run after the next fad. Men and women drawn always to the new never grow up. God’s way is growth, not change. Organic is a key image. Nothing in our past is thrown out with the garbage; it’s all composted and assimilated into a growing life. And nothing–no “moral, no “principle”–is tacked on from the outside. David at thirty-seven was more than he was at seventeen–more praise, saner counsel, deeper love. More himself. More his God-given and God-glorifying humanity. A longer stride, a larger embrace.
P. 136-147 Leap
Over A Wall–Eugene Peterson