Luke 6:12–13 says Jesus spent an entire night praying on a mountain before choosing His Twelve Apostles. Right after that, Luke records a shorter sermon given “in the plain” (Luke 6:17) that is much like the one Matthew records on a mountain, the sermon we call the Sermon on the Mount (Matthew 5–7). It opens with the Beatitudes: blessed are the poor in spirit, the mourners, the meek, the merciful, the peacemakers, the persecuted (Matthew 5:3–12). None of those look “blessed” on a social feed. Jesus is redefining the word: real blessedness comes from who we are becoming, not from how comfortable life looks.
Then He calls His disciples salt and light (5:13–16). Salt gives flavor and preserves; salt that loses its savor is useless. A light isn’t meant to be hidden under a bushel (a basket). The purpose of the light is striking: that people “glorify your Father,” not the person shining. Then comes a pattern: “Ye have heard… But I say unto you” (5:21–44). The old law said don’t kill; Jesus goes to the anger underneath (the JST removes “without a cause” from verse 22). The old law said don’t commit adultery; Jesus goes to the eyes and heart (5:27–28), which ties directly to what youth watch and scroll. He asks for simple honesty, yes meaning yes (5:37). Under Roman rule, soldiers could compel people to carry things for them (compare Matthew 27:32); Jesus says if you are compelled to go a mile, go two (5:41). And He asks us to love our enemies and pray for those who mistreat us (5:44).
Matthew 5:48 can crush a perfectionist teen: “Be ye therefore perfect.” The Latter-day Saint footnote explains that the Greek word means complete, finished, fully developed. The manual recommends Jeffrey R. Holland’s talk “Be Ye Therefore Perfect—Eventually.” The higher law isn’t a scoreboard; it is a direction, and the Savior’s grace carries us along it. For 14–16s, keep this honest: the higher law is harder than the old one, and that is exactly why it changes people. For the Strength of Youth (“Your Body Is Sacred”) teaches that our bodies are sacred and invites moral cleanliness in thoughts as well as behavior; Matthew 5:27–28 is the Savior’s own teaching behind that.