I think (the) writer Wayne Muller makes some very interesting points in his book, "Sabbath: Restoring the Sacred Rhythm of Rest." For instance.....
"God does not want us to be exhausted! The Sabbath is a time for sacred rest. It may be a holy day ... the 7th day of the week ... or the first day of the week.
But! Sabbath time may also be a Sabbath afternoon, a Sabbath hour, a Sabbath walk -- anything that preserves an experience of nourishment and rest. It is the presence of something that arises when we consecrate a period of time to listen to what is most deeply beautiful, or true.... consecrated with our attention, honoring those quiet forces of grace that sustain us and heal us."
If we do not allow for a rhythm of rest in our overly busy lives, illness becomes our Sabbath. Our pneumonia, our cancer, our heart attack ... (can) create Sabbath for us.
When we forget to rest, we will work too hard and forget.
God says: 'Please, don't. It is a waste of a tremendous gift I have given you. If you know the value of your life, you would not waste a single breath. So I give you this commandment: Remember to rest'."