When people first encounter spiritual disciplines, they think it's something important to do. As they go along, they come to understand that resting can be a discipline, too. But, they still have the frame of mind which makes 'being at rest' something to do. I'll do x amount of rest, y amount of quiet, in z place at t time. Okay, so scheduling is important. But so is ignoring the schedule, because the schedule - even on spiritual stuff - is not God. The time can be spent just being, just letting God do something for/to you instead of your always straining to do something (even a devotional or meditational something) for God. There is a time for work, and a time for rest. A time to lead and take action; a time to let the Spirit lead, to sit there and watch the wheels go round.