Looking back across the whole passage, Matthew 5:17-20 is a corridor between two ditches. On the left is the ditch of the happy moralist, who treats God’s Word as optional and quietly edits out whatever does not fit the life they want to live. On the right is the ditch of the sad moralist, who takes Scripture seriously but turns obedience into a performance, hoping that enough religious effort will earn God’s approval. Jesus draws a line down the center and says: walk here.
Both errors, as different as they appear on the surface, share the same root: self-sufficiency. The happy moralist trusts their own judgment about which parts of God’s Word apply to them. The sad moralist trusts their own effort to satisfy God’s demands. Both put the self at the center. Both push the grace of Christ to the margins. And Jesus says both are paths that lead away from the kingdom.
The gospel-centered path is neither. It takes Scripture with absolute seriousness, every iota and every dot, because it understands that God’s Word is the expression of God’s character and cannot be negotiated away. But it also refuses to treat obedience as the currency with which righteousness is purchased. The function of the Law, for the gospel-centered Christian, is to drive us to Christ. Every commandment shows us what we owe and cannot pay. Every moral standard points us to the one who paid it perfectly in our place.
He kept every iota, every dot, every commandment, not from a heart of cold external compliance, but from a heart of perfect, unbroken love for God and for others. He did what the scribes and Pharisees, for all their effort, could not do. And now, to everyone who believes, his righteousness is counted as ours. Not earned. Received. The Sermon on the Mount is Jesus standing at the door of the kingdom describing what life inside it looks like. And it begins right here: not with abandoned Scripture, not with achieved righteousness, but with a righteousness that comes from him, a righteousness received and then transforming.