Sabbath is a day of rest and re-creation. 

Mark 2:27  Then he said to them, “The Sabbath was made for man, not man for the Sabbath.” 

If there is no Sabbath no regular and commanded not-working, not-talking we soon become totally absorbed in what we are doing and saying, and God’s work is either forgotten or marginalized. When we work we are most god-like, which means that it is in our work that it is easiest to develop god-pretensions. Un-sabbathed, our work becomes the entire context in which we define our lives. We lose God-consciousness, God-awareness, sightings of resurrection. We lose the capacity to sing “This is my Father’s world” and end up chirping little self-centered ditties about what we are doing and feeling. 

Eugene Peterson

Matt is talking about Sabbath: