The Sabbath is about resetting our focus around God, our Creator & All, including our rest.

We rest in Him.

Right relationship, not just relationship.  

Also, a more difficult and growth encouraging point is:   what if we don't easily find work "life-giving & full of purpose."

Should we complain?  Give up? Quit?

No...we take it to God in prayer, we examine our intentions for working (are we working to seek consolation?   Not good.  Or are we seeking to love God more intimately deeply, lovingly).  

We can even learn to rest in Him while we work in some fashion. 

Often we don't find work initially "life giving" (digging a two foot deep, 100 linear feet long trench in your yard in clay in the summer to lay in a drainage system for the rain running down the hill to absorb and move water away from your home).

This may not seem "life-giving and full of purpose" until you begin praying about it while you work.  And then, with Him, it takes on a "hard sweetness" because He is closer.