“For when there is a change of the priesthood, there must also be a change of the law” (Hebrews 7:12)

A while ago, I sat through a teaching series on the Ten Commandments. Week after week, the message focused on how to follow these ancient rules in our modern lives. While the intent was good, a question kept circling in my mind: If so much changed at the cross, why does our approach to holiness often feel stuck in the past?

It led me to a vital truth often overlooked in the Church. Hebrews 7:12 declares, “For when there is a change of the priesthood, there must also be a change of the law.” This isn't a minor detail; it’s a foundational shift in our relationship with God. If the priesthood has changed, then the law must change with it. So why do we often act as if it hasn’t?

This question reveals a tension many Christians live in—a hybrid of grace and works. We celebrate salvation by grace but often pursue holiness through the law. We are saved by faith, but we try to become righteous by our own efforts. Yet, the Apostle Paul gives us a clear path: “So then, just as you received Christ Jesus as Lord, continue to live in him” (Colossians 2:6).

How did you receive Christ? By faith. It is the only way. It stands to reason, then, that we continue our walk with Him in the exact same manner. Paul was so passionate about this that he warned the Galatians, “All who rely on observing the law are under a curse” (Galatians 3:10). His point wasn't to discard morality but to show that trying to earn righteousness through rules was a losing battle. Jesus became that curse for us, redeeming us from its power so we could live by faith (Galatians 3:13-14).

The Flaw in the Old System

We must fix our thoughts on Jesus, the high priest of our confession (Hebrews 3:1). Why? Because the new covenant of grace He established is superior to the old system of law in every way. It is founded on better promises (Hebrews 8:6). If we have access to these better promises, it's crucial that we understand what they are and operate from that place of grace, rather than reverting to a system that was declared “obsolete and aging” (Hebrews 8:13).

This might come as a shock, but the Bible itself tells us the old system was flawed. It wasn't the law that was the problem, but its inability to change the human heart. God found fault with the people because they could not remain faithful to the covenant (Hebrews 8:7-9).

Think of an apple tree. You might find a perfectly shaped apple, but a small spot reveals a worm has been at work. If you find it early enough, the worm is still inside, because the decay always starts from the core and moves outward. The law dealt with the external—the surface of the apple—but it couldn't fix the worm inside. It highlighted the problem but couldn't provide the cure. It showed us we were broken and desperately in need of a savior.

God knew that to bring true transformation, He had to deal with the heart of man, not just our external behavior. This is why a new covenant was necessary.

The Heart of the Matter

The new covenant is profoundly different. God declares, “I will put my laws in their minds and write them on their hearts. I will be their God, and they will be my people” (Hebrews 8:10). This is the change in the law. It moved from stone tablets to the human heart. It is no longer a list of external rules to follow but an internal nature that desires to honor God.

Jesus dealt with the core of humanity. This is why we must be born again, so our nature is transformed from one bent toward sin to one fashioned after His in true righteousness (Ephesians 4:22-24). He cleanses us from the inside out. This new covenant is not of the letter that condemns, but of the Spirit that gives life (2 Corinthians 3:6).

The ministry of the old law, engraved on stone, came with a fading glory. But Paul asks, “will not the ministry of the Spirit be even more glorious?” (2 Corinthians 3:8). Jesus ushered in a new system with His priesthood, one empowered by the Holy Spirit. This allows us to live in a completely different way—not guided by a checklist of "dos and don'ts," but led by His Spirit.

The mind controlled by our sinful nature leads to death, but the mind controlled by the Spirit leads to life and peace (Romans 8:6). In fact, living by the Spirit actually fulfills the righteous requirements of the law (Romans 8:4). The new system works because it changes us from within.

Living with an Unveiled Face

Paul explains that when the old covenant is read without Christ, a veil remains over people's hearts, dulling their minds. But when anyone turns to the Lord, that veil is taken away (2 Corinthians 3:14-16). Where the Spirit of the Lord is, there is freedom. In this freedom, we can behold the Lord’s glory with unveiled faces and are “transformed into his likeness with ever-increasing glory” (2 Corinthians 3:18).

Instead of focusing on the Ten Commandments, which can inadvertently place a veil over our hearts, our focus should be on Christ. His law is now written on our hearts. We don’t need to be told what the law is; we know it intuitively as we walk by the Spirit. We can now look at the law through the filter of Christ, who perfectly fulfilled it and gave us a new way to live.

This is why a change in priesthood required a change in law. Through Christ, a better hope is introduced, one that allows us to confidently draw near to God (Hebrews 7:19).

Personal Reflection Questions

1. In what specific areas of your life do you find yourself relying on a checklist of "dos and don'ts" rather than resting in the finished work of Christ?

2. God promised to write His laws on our hearts and minds. Reflect on a recent decision you made. Did you feel guided by an internal sense of God's will, or were you more focused on following an external rule?

3. Knowing that the Holy Spirit empowers us to live a new life of freedom, what is one burden of performance or guilt you can release to God this week, trusting in His Spirit to transform you from the inside out?