If we understand the Sabbath to be a creation ordinance (Gen. 2:2-3) rather than a Mosaic ordinance (Ex. 20:8-11), and also understand it to be the destiny of man (that is, our eschatological rest, as per Heb. 3:7-4:13), then the implications of what it means to observe that day should be relatively clear.

I emphasize should. I am still confused. More to follow. I know I said I'd leave the issue to rest, but I can't.