The Sabbath Question

The sabbath was made for man, not man for the sabbath.
Does this mean that it's a gift and that if we "can't" use it right now, it's okay? Kind of like someone giving you a beautiful quilt but it's summertime and it's too hot to use it? Or because it's a command, we keep the sabbath holy, set apart for God alone?

Some say it was changed to Sunday, I don't see that at all.
Some say that our entire lives are to be holy so we don't keep a sabbath any longer. That one almost makes sense to me but our entire lives were ALWAYS meant to be holy.
I'm trying to find out the truth on this because once again I can go get a job easily if i work on Saturday. I don't know how to tell if this keeps coming up because it's a test to see how faithful I'll be or if it's a way to draw my attention to it so that I see it's not necessary.

Rereading what I wrote made me think of one thing - the laws were instituted because the Israelites were NOT staying apart as they were intended to do. Maybe this was a minimum starting point.
No, guess not. They were commanded to remember the sabbath as if they already knew about it before the laws were specifically written down. Did the laws other people had include a sabbath (the laws of Hammarabi for example)?