To be human, finally, is not to be a worker but to be one whose life is directed toward God. The whole notion that one rests from work not to recharge for more work but to say that the world is not finally sustained by man's efforts has been of great importance in Christian, as well as Jewish, thinking about work. In addition to Sabbath, there are other activities that limit claims of the centrality of work - I am thinking of things such as play, leisure, and rest. The distinction between work and play, though apparently obvious at one level, is, in fact, a difficult concept to understand clearly. For example, some seem to want to argue that, at the highest level, when the worker is fully involved in his work, it is difficult to distinguish work from play.
Leisure is something different.
The point of leisure is not to recharge in order to work better. Leisure, finally, is a kind of activity - not an activity that is productive in the same way as work but in a way that engages the highest human capacities, whatever those finally are. For classical thinkers, that capacity is love for the True, the Beautiful, and the Good. For Christian thinkers, that capacity is resting in God, as when Saint Augustine writes in the first chapter of the first book of his Confessions that our hearts are restless until they rest in God. When the classical notion of leisure as the highest kind of human activity is Christianized, the highest form of human activity moves beyond love for the True, the Good, and the Beautiful, to worship.