"If you love me, keep my commands" (John 14:15).
If one truly obeys the two Great Commandments they are fulfilling the Law.
Sounds good to me...(unless by fulfilling you mean destroying the Law so that others don't have to keep it...)
How do we truly obey those two?
The first is to love Yah. "If you keep My commandments, you will remain in My love, just as I have kept My Father’s commandments and remain in His love. "
So we remain in His love by keeping His Father's commandments too...note the "just as"
The second is to love your neighbor as yourself, how?
"12This is My commandment, that you love one another as I loved you..."
Notice the "AS I" loved you...and His love included following His Father's will
So to truly obey the two commandments of loving Yah and loving each other we must include Sabbath observance as modeled by the One Who said love fulfills the law...this love keeps it...duh
Even Buddhists and Muslims, heathen and pagans, love a god and love each other...but our love has a higher standard as it is of One with a higher love.
John summarizes: "By this we can be sure that we have come to know Him: if we keep His commandments. 4If anyone says, “I know Him,” but does not keep His commandments, he is a liar, and the truth is not in him.…"
“... that you love one another as I have loved you."
(He offered Sabbath rest...never Sunday Ham)