Hi Twinky,
Your comment posted while I was writing mine. IMO, paradox is one of those things that many people could describe as difficult.
In the context of this Sabbath discussion, it appears that both the concept of keeping the sabbath AND NT grace may be true.
Embracing paradox might be an intellectual skill that could reduce the associated cognitive dissonance.
Rather than denying the need for the underlying concept of a day of rest and honoring God, a person might be able to recognize and accept it, but realize it's not necessarily a dogma that necessitates a troubling bondage for the person who is unable to practice the "letter of the law."