On Sunday, Reverence, and Christian Obedience

There is a quiet shift taking place in modern Christianity. It does not announce itself as rebellion. It presents itself as flexibility. It speaks the language of grace and freedom. But underneath it lies something more troubling: the steady privatization of the Lord’s Day.

Many sincere Christians now say some version of the same thing: “The specific day doesn’t matter. What matters is that I worship.” Or, “Every day is the Lord’s Day.” Or, “I rest when I can — God understands.”

But the question is not whether God understands. The question is whether we understand what God has declared holy.

The sanctification of time does not begin in the Mosaic law. It begins in creation itself. “So God blessed the seventh day and made it holy” (Book of Genesis 2:3). Before Israel existed, before priesthood, before sacrifice, God set apart a day. Sacred time is woven into the structure of reality.

When the command is later given — “Remember the Sabbath day, to keep it holy” (Book of Exodus 20:8) — it is grounded not in temporary ritual but in creation order. The commandment is not simply about rest; it is about acknowledging that time belongs to God.

Christ does not abolish this principle. When He says, “The Sabbath was made for man, not man for the Sabbath” (Gospel of Mark 2:27), He corrects distortion, not obligation. He restores the Sabbath to its true meaning. He does not render sacred time negotiable.

After the Resurrection, the Church does not abandon consecrated time. She gathers on the first day of the week (Acts of the Apostles 20:7). Offerings are set aside on that day (First Epistle to the Corinthians 16:2). The first Christians understood that the Resurrection inaugurates a new creation, and thus the Sabbath finds its fulfillment in Sunday — the Lord’s Day. Already in the early second century, Ignatius of Antioch testifies that Christians live according to the Lord’s Day, not the old Sabbath.

Sunday is not a convenience. It is not a tradition that can be relocated to fit modern schedules. It is the apostolic fulfillment of the command to sanctify time.

The deeper issue is authority. Who determines which day is holy? If the answer is “the individual believer,” then sacred time has become self-assigned. But sacredness, by definition, is declared by God and received by man.

Augustine of Hippo reminds us, “You have made us for Yourself, O Lord, and our hearts are restless until they rest in You.” For Augustine, Sabbath rest ultimately points to the eternal rest of heaven — the everlasting participation in God’s life. Sunday is not arbitrary. It is eschatological. It is the weekly proclamation that Christ is risen and that a new creation has begun. To treat Sunday as interchangeable with any other day is to reduce resurrection time to personal convenience.

Thomas Aquinas provides necessary clarity. In the Summa Theologiae, he explains that while the ceremonial aspects of the Old Law are fulfilled in Christ, the moral requirement to set aside time for divine worship remains binding. The Church, possessing authority from Christ, determines that this obligation is fulfilled on Sunday, the Lord’s Day. The moral command remains; its form is fulfilled and elevated. What Aquinas does not permit is individual customization. Sacred time is not a private project.

Some object that insisting on Sunday observance is “legalistic.” But obedience is not legalism. Legalism is the attempt to justify oneself through rule performance. Honoring Sunday because God, through His Church, has commanded it is not self-justification — it is submission. “To obey is better than sacrifice” (First Book of Samuel 15:22).

The word “legalism” is often used when obedience becomes inconvenient.

Here the insight of Dietrich von Hildebrand is especially helpful. Hildebrand argues that the foundation of moral life is reverence — the adequate response to objective value. Sacred time is an objective value. Sunday is not holy because we find it meaningful. It is holy because it has been declared so in the life of the Church from the apostolic age. To treat it as flexible is not merely to rearrange a calendar; it is to fail in reverence.

Modern culture worships productivity and autonomy. Sunday interrupts both. It says: you are not defined by your work. You are not sovereign over your time. Christ is Lord — even of your schedule.

The Protestant instinct to protect freedom is understandable and historically rooted. But freedom detached from authoritative continuity easily drifts into privatization. When each believer determines for himself how and when to fulfill what was once a concrete command, sacred time dissolves into abstraction. “I worship every day” sounds pious. But in practice, it often means that no day is truly set apart.

Sunday is not an arbitrary ecclesial preference. It is the day of the Resurrection. It is the day on which the Church has gathered from the beginning. It is the concrete fulfillment of the command to sanctify time. To neglect it, relativize it, or relocate it to suit personal preference is not a small adjustment. It is a quiet declaration of independence from received authority.

Christ Himself prayed, “Not my will, but Yours be done” (Gospel of Luke 22:42). The Lord’s Day is a weekly opportunity to pray that prayer with our calendars.

God asks for one day. Not one day of vague spirituality. Not one day whenever convenient. One specific day, consecrated in memory of the Resurrection.

Sunday is not optional because reverence is not optional.

And how we honor the Lord’s Day reveals who we believe truly reigns.