Here is the reason the WT gives
w04 2/1 p. 8 "Lord, Teach Us How to Pray" "A certain one of his disciples said to him: ?Lord, teach us how to pray.?"?LUKE 11:1.
ON ONE occasion in 32 C.E., a disciple of Jesus observed Him praying. He could not hear what Jesus was saying to his Father, for it was probably a silent prayer. Nevertheless, when Jesus finished, the disciple said to him: "Lord, teach us how to pray." (Luke 11:1) What prompted this request? Prayer was a regular part of Jewish life and worship. The Hebrew Scriptures contain numerous prayers in the book of Psalms and elsewhere. So the disciple was not asking to be taught something that he knew nothing about or that he had never done. Doubtless, he was familiar with the formalistic prayers of the religious leaders of Judaism. But now he had observed Jesus praying, and he likely sensed that there was a big difference between the sanctimonious prayers of the rabbis and the way Jesus prayed.?Matthew 6:5-8.
2 Some 18 months earlier, in his Sermon on the Mount, Jesus had provided his disciples with a model upon which to base their prayers. (Matthew 6:9-13) Possibly this particular disciple was not present at that time, so Jesus kindly repeated the essential points of that model prayer. Noticeable is the fact that he did not repeat it word for word, indicating that he was not giving a liturgical prayer to be recited by rote. (Luke 11:1-4) Like that unnamed disciple, we too want to be taught how to pray so that our prayers will draw us closer to Jehovah. Let us therefore examine the fuller version of the model prayer, as recorded by the apostle Matthew. It consists of seven requests, of which three concern God?s purposes and four concern our material and spiritual needs. In this article, we will consider the first three petitions.
*** w04 9/15 p. 4 The Lord?s Prayer?Its Meaning for You ***
The Lord?s Prayer?Its Meaning for YouTHE Lord?s Prayer, as given by Jesus Christ in the Sermon on the Mount, is found in the Bible at Matthew chapter 6, verses 9 through 13. Just before giving this prayer, Jesus said: "When praying, do not say the same things over and over again, just as the people of the nations do, for they imagine they will get a hearing for their use of many words."?Matthew 6:7.
Clearly, then, Jesus did not intend that the Lord?s Prayer be recited word for word. True, he later repeated this prayer for the benefit of another audience. (Luke 11:2-4) But the wording of the prayer differs somewhat in the Gospel accounts of Matthew and Luke. Moreover, later prayers by Jesus and his disciples did not rigidly adhere to the specific words of his model prayer.
The footnote for Matthew 6:7 reads "do not babble words do not utter empty repetitions" Which is maybe different to saying the same things over and over.