The great rabbi decried the antipathy for old age and the trivialization of retirement. He urged America to do better.
The Sabbaths are our great cathedrals, the Jewish equivalent of sacred architecture.
Heschel draws out the implications of the idea that we rest in memory/imitation of God's primeval rest at the end of Creation.
We are often blind to the dimension that lacks physical substance, and that can lead to enslavement to things.