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Luke 6:39–49 completes Jesus’ teaching in the Sermon on the Plain, continuing directly from His words about mercy, forgiveness and judgement. Jesus first gives us two searching pictures: the blind leading the blind, and the man trying to remove a speck from his brother’s eye while a plank remains in his own. The point is not that we should never help or correct another believer. Rather, we must first allow Christ to deal honestly with us. Much judgement can arise from self-righteousness rather than mercy. Jesus calls us to see clearly ourselves before attempting to help somebody else — and then to do so with gentleness, clarity and love.
At the centre of this is Jesus’ statement that “a disciple is not above his teacher, but everyone who is perfectly trained will be like his teacher.” Biblical discipleship is training. We become increasingly like Christ as we sit under His Word, allow Him to correct us, and practise what He teaches. Scripture is given to instruct and train us in righteousness, not merely to increase our biblical knowledge. We have been brought into God’s family, and there should increasingly be a family resemblance. The goal is not simply knowing more about Jesus but being formed by Him — learning His character, His ways and His obedience.
Jesus then moves naturally to the picture of a tree and its fruit. A good tree does not bear bad fruit, and a bad tree does not bear good fruit. Every tree is known by its fruit. Appearances can be maintained for a time, but eventually fruit tells the truth. Jesus takes the lesson deeper still: “Out of the abundance of the heart his mouth speaks.” Our words, reactions and tone — especially when pressure comes — reveal something of what has been stored within us. The issue is not merely improving behaviour on the surface. Christ changes the heart. In Him we become a new creation; the old is put off, the new is put on, and we are called to walk in newness of life.
That is also why genuine Christian fruit matters. James tells us that faith without works is dead. Those works do not earn salvation, and good fruit is not the foundation upon which God accepts us. Rather, fruit is evidence that something real has happened within. A changed heart increasingly produces a changed life. There will be growth, correction and sometimes failure along the way, but Christian faith is never intended to remain merely an outward confession disconnected from obedience. Christ does not simply make us sound more spiritual; He makes us new and then teaches us to live consistently with what He has made us.
That leads directly to Jesus’ final picture: the two foundations. “Why do you call Me ‘Lord, Lord,’ and not do the things which I say?” The person who comes to Christ, hears His words and does them is like a man who digs deep and lays his foundation upon the rock. The flood rises, the stream beats violently against the house, but it stands because of its foundation. Another person hears but does nothing, and when the same storm comes, the house falls. The difference is not whether storms arrive — they come to both houses. Storms reveal what the life was built upon. The question for each of us is therefore deeply personal: Am I simply hearing Christ, or am I building my life upon Him by obeying what He says? He is the sure foundation. When life is shaken, there is no safer place to stand.
Watch or listen to this study from Luke 6:39–49 as we consider what our words and actions reveal about the heart, what genuine spiritual fruit looks like, and whether we are building our lives upon the solid foundation of Christ and His Word.
Scriptures Mentioned / Referenced
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- Luke 6:39–49 — main passage
- Matthew 7:1–5 — the speck and plank
- Matthew 7:24–27 — the parallel teaching about the two foundations
- 2 Timothy 3:16–17 — Scripture and training in righteousness
- Romans 8:15 — the Spirit of adoption and “Abba, Father”
- John 3:16 — God’s love in giving His Son
- 2 Corinthians 5:17 — the new creation in Christ
- Ephesians 4:22–24 — putting off the old man and putting on the new
- Romans 6:4 — walking in newness of life
- James 2:17 — faith without works is dead
