Hebrews emphasizes that spiritual growth and glorification depends on an individual's relationship with Christ, the centerpiece of the Book of Hebrews.
Paul never taught any Jew to forsake the Law of Moses, but he did warn against Pharisaical additions for the expressed purpose of attaining justification.
John Ritenbaugh, reflecting on the propensity of people to break the Sabbath, explains that the carnal mind is enmity against God. Human nature is hopelessly perverse. In a book review of Steven Miller's book The Peculiar Life of Sundays, appearing in the Charlotte Observer, the reviewer suggests that even the worldly 'Sunday …
Love, justice, mercy, and fidelity (the weightier matters of the law) God desires more than meticulous, mechanical religiosity.
Jesus Christ's and Paul's example in Sabbath observance (including the annual Sabbaths) provide a model as to how we keep the Sabbath and the holy days.
The Sabbath is not a mere ceremonial observance, but identifies God's people as different, and consequently a perpetual irritant to the world.