The Sermon on the Mount Explained: What Jesus Really Taught in Matthew 5–7
And seeing the multitudes, he went up into a mountain: and when he was set, his disciples came unto him: And he opened his mouth, and taught them. — Matthew 5:1–2 (KJV)
The Sermon on the Mount is arguably the most famous teaching in human history. Three chapters in Matthew's Gospel — chapters 5, 6, and 7 — contain more revolutionary ethical and spiritual instruction than almost anything else ever spoken or written.
And yet it is frequently misunderstood.
Some treat it as an impossible ideal — a standard no one can reach, meant only to drive us to despair of our own goodness and to Christ for grace. Others treat it as a simple moral program — just follow these principles and you'll live a good life.
The truth is more demanding and more glorious than either of these readings.
The Setting: A New Moses on a New Mountain
Matthew frames the Sermon carefully. Jesus sits on a mountain and teaches — evoking Moses who received the Law on Mount Sinai. But where Moses received law from God, Jesus speaks with his own authority: "You have heard that it was said... but I say unto you."
This is not Moses. This is the one Moses pointed to — the prophet greater than Moses (Deuteronomy 18:15). Jesus is not just interpreting the Law; he is fulfilling it and unveiling its deepest meaning.
The audience is his disciples — those who have already begun to follow him. The Sermon is not an entry requirement for salvation; it is a description of life under the reign of God.
The Beatitudes (Matthew 5:3–12): Surprising Blessings
The Sermon opens with nine statements of blessedness — the Beatitudes:
| Beatitude | Blessing | |-----------|---------| | Poor in spirit | Theirs is the kingdom of heaven | | That mourn | They shall be comforted | | The meek | They shall inherit the earth | | Hunger and thirst for righteousness | They shall be filled | | The merciful | They shall obtain mercy | | The pure in heart | They shall see God | | The peacemakers | They shall be called sons of God | | Persecuted for righteousness | Theirs is the kingdom of heaven |
These pronouncements are startling. The people Jesus calls blessed are not the powerful, the successful, the admired, or the comfortable. They are the poor in spirit, the mourning, the meek — the ones the world passes over.
The Beatitudes describe not what you must do to earn blessing, but who receives blessing under the reign of God. They are descriptions of the people who have turned to Jesus and discovered the radical reversal his kingdom brings.
The phrase "kingdom of heaven" — unique to Matthew — describes God's active reign, now present in Jesus. The Beatitudes say: this is what it looks like when God's reign arrives.
Salt and Light (Matthew 5:13–16)
Jesus tells his disciples they are "the salt of the earth" and "the light of the world." Both images speak to influence — salt preserves and flavors; light illuminates and exposes.
Disciples are not to hide their transformed life — they are to let it be visible, so that others see their good works and give glory not to them, but to the Father.
The Law Fulfilled (Matthew 5:17–20)
Jesus makes a bold claim about his relationship to the Old Testament:
Think not that I am come to destroy the law, or the prophets: I am not come to destroy, but to fulfil. — Matthew 5:17 (KJV)
He then deepens the Law in six antitheses:
Murder → Anger: The command not to murder goes deeper — it reaches to unjust anger, contempt, and insults. The heart is the battlefield.
Adultery → Lust: The command not to commit adultery reaches to the lustful look. Again, the heart.
Divorce: Jesus calls divorce (except for unfaithfulness) a violation of God's design for marriage, which was permanence.
Oaths: Don't use elaborate oaths to make your word seem more reliable — simply let your yes be yes and your no be no.
Retaliation: Instead of an eye for an eye, offer the other cheek. Return evil with unexpected generosity.
Love your enemies: The most radical command — love not just neighbors but enemies. Pray for those who persecute you. This is the standard of the Father, who sends rain on both the just and the unjust.
Each of these goes deeper than the letter of the Law. Jesus is not abolishing the Law — he is revealing what it always required at the level of the heart.
Authentic Piety (Matthew 6:1–18)
In chapter 6, Jesus addresses three practices of Jewish devotion — giving, prayer, and fasting — and corrects the way the religious establishment practiced them.
The pattern is repeated three times:
- Don't do it for show, to be seen by others
- Instead, do it in secret, before your Father
- And your Father, who sees in secret, will reward you
The Lord's Prayer (Matthew 6:9–13) appears in this section as a model for prayer — not a formula to recite but a pattern to guide:
- Our Father in heaven — prayer is addressed to a personal Father
- Hallowed be thy name — the primary concern is God's glory
- Thy kingdom come, thy will be done — submission to God's reign
- Give us this day our daily bread — simple dependence on God for provision
- Forgive us our debts, as we forgive our debtors — forgiveness sought and extended
- Lead us not into temptation — request for protection and deliverance
Money and Anxiety (Matthew 6:19–34)
Jesus turns to wealth and worry — two realities that compete with wholehearted allegiance to God.
No man can serve two masters: for either he will hate the one, and love the other; or else he will hold to the one, and despise the other. Ye cannot serve God and mammon. — Matthew 6:24 (KJV)
Accumulating treasure on earth is foolish — moths and rust corrupt it, and thieves steal it. The wise person stores up treasure in heaven. The heart follows the treasure.
On anxiety, Jesus makes a stunning claim: look at the birds and the flowers. If God clothes the grass and feeds the birds, will he not much more care for you? Anxiety reveals misplaced trust — a failure to believe that the Father knows what you need. The antidote is to seek first the kingdom of God and his righteousness, and everything else will be provided.
Warnings and the Two Ways (Matthew 7)
The Sermon closes with a series of warnings and contrasts:
Do not judge uncharitably — address the beam in your own eye before the speck in your brother's.
Ask, seek, knock — God is a good Father who gives good gifts to those who ask. The Golden Rule: "All things whatsoever ye would that men should do to you, do ye even so to them."
The narrow gate — the way to life is narrow and few find it; the way to destruction is broad.
False prophets — recognized by their fruit, not their words.
The Two Builders — those who hear Jesus's words and do them are like a man who built on rock; those who hear but don't obey are like a man who built on sand. When the storm came, one house stood; the other fell.
What the Sermon Demands
The Sermon on the Mount demands impossibly more than the Law if read as moral effort. No one can produce from themselves this quality of love, purity, humility, and forgiveness.
But that is exactly the point. The Sermon assumes the new birth — a transformed heart brought about by the Spirit. Jesus is describing the life that flows from a person who has been born again, who has received the kingdom, who is living under God's reign.
The Sermon does not save you. But it describes what you look like when the one who saves you begins to change you from the inside out.
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