Matthew 7:12. So whatever you wish that men would do to you, do so to them; for this is the Law and the Prophets.

With these words He concludes the teaching He has been giving in these three chapters, and wraps it all up in a little package where it can all be found. Thus everyone can put it in his bosom and keep it; it is as if He were saying: “Would you like to know what I have been preaching, and what Moses and all the Prophets teach you? I shall tell it to you so briefly and put it in such a way that you dare not complain about its being too long or too hard to remember.” This is the kind of sermon that can be expanded or contracted; from it all teaching and preaching go forth and are broadcast, and here they come back together. How could it be put more succinctly and clearly than in these words? The trouble is that the world and our old Adam refuse to let us ponder what He says and measure our lives against the standard of this teaching. We let it go in one ear and out the other. If we always measured our lives and actions against this standard, we would not be so coarse and heedless in what we do, but we would always have enough to do. We could become our own teachers, teaching ourselves what we ought to do; and we would not have to chase after holy lives and holy works, nor would we need many lawyers and law books. This is stated briefly and learned easily, if we only were diligent and serious in acting and living according to it.

Let me illustrate it with a somewhat crude example. Surely there is no one who would enjoy being robbed; if he asks his own heart about this, he has to say that he really would not enjoy it at all. Now, why does he fail to draw the conclusion that he should treat others the way he wants to be treated? At a market, you see everyone marking up his prices as high as he pleases, asking 30 pfennigs for something that is not worth  If you ask him, “Friend, would you want to be treated that way?” he must be honest and reasonable enough to say: “I would be willing to pay for it what its market value is and what would be reasonable and proper, so that I am not overcharged.” There, you see, your heart is telling you honestly how you would like to be treated. And your conscience is arguing that you should treat others the same way; it can teach you well about your relations with your neighbor in buying and selling and all kinds of business, all things belonging to the Seventh Commandment (Ex. 20:15): “You shall not steal.” (Luther’s Works, v. 21, pages 235-236).

It would be possible to interpret the three statements (“Ask, and it will be given you; seek, and you will find; knock, and it will be opened to you.”) to mean that He is repeating the same thing in different words to point to that constancy in prayer about which St. Paul admonishes in Romans 12:12: “Constant in prayer.” Then it would be equivalent to His saying: “It is not enough just to begin and to sigh once, to recite a prayer and then to go away. As your need is, so should your prayer be. Your need does not attack you once and then let you go. It hangs on, it falls around your neck again, and it refuses to let go. You act the same way! Pray continually, and seek and knock, too, and do not let go.” This is the lesson of the parable in Luke 18:1–8 about the widow. She was so persistent and importunate in her refusal to let go of the judge that he was overpowered and had to help her in spite of himself. How much more, Christ argues there (Luke 18:7), will God give us if He sees that we do not stop praying but go right on knocking so that He has to hear it? This is all the more so because He has promised to do so and shows that such persistence is pleasing to Him. Since your need goes right on knocking, therefore, you go right on knocking, too, and do not relent. For you have His Word, and He will have to say: “All right, then, you may have what you want.” St. James speaks of this in his Epistle when he says (James 5:16): “The prayer of a righteous man has great power in its effects” if it is serious and persistent; and in support of this he cites the example from the Scriptures of the prophet Elijah (James 5:16, 17). By urging you not only to ask but also to knock, God intends to test you to see whether you can hold on tight, and to teach you that your prayer is not displeasing to Him or unheard, simply because His answer is delayed and you are permitted to go on seeking and knocking. (Luther’s Works, v. 21, pages 234-235).

Why does Christ use so many words? He lists three items: “Ask, and it will be given you; seek, and you will find; knock, and it will be opened to you.” One would have been enough. It is evident, as has been said, that by this He intends to admonish us even more strongly to pray. He knows that we are timid and shy, that we feel unworthy and unfit to present our needs to God. We feel the needs, but we cannot express them. We think that God is so great and we are so tiny that we do not dare to pray. This, too, is a great hindrance from the devil, and it does great damage to prayer. That is why Christ wants to lure us away from such timid thoughts, to remove our doubts, and to have us go ahead confidently and boldly. Though I am unworthy, I am still His creature; and since He has made me worthy of being His creature, I am also worthy of receiving what He has promised and so generously offered to me. In other words, if I am unworthy, He and His promise are not unworthy. You can venture on this vigorously and trustfully, you can put it in His lap joyfully and confidently. But above all, be sure that you really believe in Christ and that you have a proper occupation, one that pleases God, so that you are not like the world, which does not care about its occupation but only about the vices and the villainy that it goes right on planning day and night. (Luther’s Works, v. 21, pages 233-234).