"Abide in me," Jesus tells us, "and you will bear much fruit." Yet too often we forget that fruit needs different seasons in order to grow. We measure our spiritual maturity by how much we do rather than how we are responding to our current spiritual season. In Spiritual Rhythm, Mark Buchanan replaces our spirituality of busyness with a spirituality of abiding. Sometimes we are busy, sometimes still, sometimes pushing with all we've got,...