The defining characteristic of Christian disciples is not that they do good things; it’s that they are good in their motives. Their motives have been made good by the supernatural grace of God.

The only thing that surpasses right doing is right being. Jesus Christ came to put a new heredity into anyone who would let him, a heredity that would surpass the righteousness of the Pharisees. Jesus says, in essence, “If you are my disciple, you must be right not only in how you live but also in your motives and your dreams, in the deepest recesses of your mind. You must be so pure in your motives that God Almighty can see nothing to censure.”

Who can stand in the eternal light of God and have nothing for God to censure? Only the Son of God. Jesus Christ claims that, by the power of his redemption, he can put his own disposition into anyone, making them as pure and simple as a child. The purity God demands is impossible for me unless I can be remade from within—and this is exactly what Jesus Christ has undertaken with his redemption.

None of us can make ourselves pure by obeying laws. Jesus Christ doesn’t give us rules and regulations. His teachings are truths which only he can interpret. If we wish to understand them, we must do so through the disposition he puts in us—his own disposition. This is what it means that Jesus Christ alters our heredity: he doesn’t alter
human nature; he alters the disposition of sin that lies beneath it. This is the great marvel of his salvation.

Wisdom from Oswald

The great word of Jesus to His disciples is Abandon. When God has brought us into the relationship of disciples, we have to venture on His word; trust entirely to Him and watch that when He brings us to the venture, we take it.
Studies in the Sermon on the Mount