How to Be Jesus People

The Sermon on the Mount is one of the most well-known teachings of Jesus, guiding Christians on how to live in an unholy world. In Matthew 5:2-16, Jesus focuses on how believers are to be a countercultural people (Mt 5:2-12), living as salt and light in the world (Mt 5:13-16). But what does that mean? And how exactly are we supposed to do that?

Understanding the Christian Counterculture

Jesus emphasizes that Christians are not meant to isolate themselves from the world but rather to live differently within it. Being salt and light means standing out—not in a showy or arrogant way, but in a way that draws others to the truth of the gospel. This means engaging with the world while remaining distinct from its values.

The key question, then, is: how do we live as a countercultural people? In Mathew 5:17-20, Jesus answers this by teaching that we must obey God’s law in the right way—with the right heart and the right motives.

First, he explains how he fulfills the law and the prophets.
Then, he explains our obligations to live according to the law n light of what he’s now done.

The rest of Matthew 5 is Jesus’ illustrations of this principle through everyday examples.

Jesus Fulfills the Law

Many misunderstand Jesus’ relationship to the Old Testament law. Some think He came to replace it with something entirely new, but He clarifies: “Do not think that I have come to abolish the Law or the Prophets; I have not come to abolish them but to fulfill them” (Matthew 5:17).

But what does it mean for Jesus to “fulfill” the law? Essentially, Jesus gives the law its deeper and truer meaning. Instead of following it in a superficial, legalistic way—like the Pharisees did—Jesus calls His followers to obey it from the heart.

How Do We Read the Law Through the ‘Jesus Filter’?

The Bible is a story with a beginning, middle, and end. When we read the Old Testament, we must do so in light of Jesus’ life, death, and resurrection. This is the “Jesus filter”—understanding that everything in Scripture points to Him.

Here is what this looks like:

For example, the sacrificial laws in Leviticus can seem tedious, but they make sense when we realize they were all pointing to Jesus, the ultimate sacrifice. Just like a child might look forward to getting a bicycle, only to later realize that a car is even better, the Old Testament sacrifices (i.e., the ceremonial laws) were placeholders until Christ, the true fulfillment, came.

Three Types of Old Testament Laws

Ceremonial Laws – These included sacrifices, purity laws, and temple rituals. Jesus fulfills these laws by becoming the ultimate sacrifice. Since His death and resurrection, these laws no longer apply in a direct way.
Civil Laws – These governed daily life in ancient Israel, from property disputes to social justice. Since the Old Testament kingdom no longer exists in the same way, these laws don’t directly apply today, though we can learn principles from them.
Moral Laws – These include commandments about right and wrong, like prohibitions against murder, adultery, and lying. These remain in effect because they are rooted in God’s unchanging character.

Because the new covenant has fulfilled or re-shaped the first two categories of the old covenant law, Jesus now pivots in the rest of Matthew 5 to focus solely on moral laws and their relevance for today. He says: “Therefore anyone who sets aside one of the least of these commands and teaches others accordingly will be called least in the kingdom of heaven, but whoever practices and teaches these commands will be called great in the kingdom of heaven” (Mt 5:19).

What does this mean?

Obeying the Law in the Right Way

Jesus warns that it is possible to do the right thing for the wrong reasons. If we simply follow rules without love or genuine devotion, our obedience is meaningless. This was the problem with the Pharisees, who were obsessed with external appearances while missing the heart of God’s law. They wrongly saw the old covenant law as a means of salvation—“I do this for God, and he will do that for me!” This produces a very self-righteous attitude.

Jesus says, “Unless your righteousness surpasses that of the Pharisees and the teachers of the law, you will certainly not enter the kingdom of heaven” (Matthew 5:20). That doesn’t mean we need to follow even more rules than they did—it means our obedience should come from a place of love, not just obligation. We obey God because we love him and have already been made right with God, not to “get” righteousness as a reward at the end of the rainbow.

For example, the commandment: “You shall have no other gods before me” is easy to affirm in theory. But if we examined our lives, what would our actions say? Do we prioritize God above all else? Or do we let other things—our jobs, entertainment, relationships—take first place in our hearts? There is a massive difference between surface conformity and heartfelt obedience. True obedience isn’t just about external actions but about having a heart transformed by love for God.

Faith Expressing Itself Through Love

The Apostle Paul summed it up in Galatians 5:6: “The only thing that counts is faith expressing itself through love.” This means that our obedience to God should not come from fear or duty but from a genuine love for Him. Just as a heartfelt note from a loved one is more meaningful than a generic greeting card from your insurance agent, our devotion to God should be personal and sincere.

Jesus’ teachings in the rest of Matthew 5 give practical examples of this principle. He takes the external commands (like “Do not murder” and “Do not commit adultery”) and shows their deeper meaning. It’s not enough just to avoid murder—we must also guard against anger and hatred. It’s not enough just to avoid adultery—we must also keep our hearts pure.

A Call to Authentic Christianity

Being a Christian counterculture means more than just appearing religious. It means having a heart genuinely transformed by Christ. True righteousness flows from within—it’s not about keeping a checklist of rules but about loving God so deeply that obedience becomes natural.

This is the challenge Jesus sets before us. Are we simply following religious rules, or are we truly living as salt and light in the world? Do we obey because we have to, or because we want to?

Jesus calls us to follow Him from the heart, to let our love for Him shape every aspect of our lives. When we do this, we don’t just become religious people—we become a living testimony of God’s grace and truth.

May we each examine our hearts and ask God to help us live out our faith in a way that is truly countercultural—not just in appearance, but in spirit and truth.