This discussion on the sabbath really connects to a larger discussion on the place of the Old Testament in our lives. I like this :
"Our freedom from the law as a way of salvation does not mean that we are free from the law as a guide to conduct. The fourth commandment ( Remember the Sabbath) is as much a part of that coherent family code as is any of the other nine."
and else where :
" Rebellious people do not want to rest in God's work or celebrate His creation. Like our first parents, we each want to be our own god. We want to rest in our own works and celebrate our own accomplishments."
Book: Pathway to Freedom Author: Alistair Begg