While serving as a missionary in Mexico - in the late 80's - we had a question come from a member of another faith. He sincerely wanted to know why we honored the sabbath on Sunday instead of on Saturday.

That question proved to be a tremendous faith-builder for me. I researched and pondered on many things that I hadn't known before. My understanding of the sacredness of the day and it is a protection in the last days for those who honor it - nourished the seed that was already planted in me and....taught me a tremendous amount about the Lord's reasons for his commandments.
President Kimball shared some powerful truths about the importance of the day:
"We have
become largely a world of Sabbath breakers. On the Sabbath the lakes are
full of boats, the beaches are crowded, the shows have their best
attendance, the golf links are dotted with players. The Sabbath is the
preferred day for rodeos, conventions, family picnics; even ball games
are played on the sacred day. “Business as usual” is the slogan for
many, and our holy day has become a holiday. And because so many people
treat the day as a holiday, numerous others cater to the wants of the
fun-lovers and money-makers.
"To many, Sabbath-breaking is not important, but to our Heavenly Father it is disobedience to one of the principal commandments. Moses
came down from the quaking, smoking Mount Sinai and brought to the
wandering children of Israel the Ten Commandments, which are fundamental
rules for the conduct of life. These commandments, however, were not
new. They had been known to Adam and his posterity, who had been
commanded to live them from the beginning, and were merely reiterated by
the Lord to Moses. These commandments even antedated earth life and
were part of the test for mortals established in the council in heaven
“to see if they will do all things whatsoever the Lord their God shall
command them.” (Abr. 3:25.)
"Sabbath-breakers, also are those people who buy commodities or
entertainment on the Sabbath, thus encouraging pleasure palaces and
business establishments to remain open—which they otherwise would not
do. If we buy, sell, trade, or support such on the Lord’s day we are as
rebellious as the children of Israel, the dire consequences of whose
transgressions against this and other commandments should be a permanent
warning to us all."
We do live in a day of much Sabbath-breaking. If we heed prophetic counsel we will have promised blessings. If we live after the manner of the world - we're not promised the same.
I often recall the message of Sister Elaine Cannon who said "When the Prophet speaks, the debate is over." And...a message from a church speaker one day who reminded that "right is always right even if no one is doing it and....wrong is always wrong even if 'everyone' is doing it'.
I love the Sabbath day. It provides a respite from long, hard weeks, and a time to rest from the cares of the world. It's a time for reflection, renewing and rejuvenation.