Likutei Moharan 65:6/ליקוטי מוהר"ן ס״ה:ו׳

16. When the eyes of the Master of the Field shine, in the aspect of “Seers Field,” he is able to look into each person and see if he is close to the ultimate goal. When [the Master of the Field] sees that someone is far from the ultimate goal, that the person’s prayer is not yet fully perfected—since he is unable to make the entire prayer one, for when he is at the end of the word he has forgotten its beginning and cannot unify his prayer in the aspect of oneness explained above—the Master of the Field looks into him and brings him to the ultimate goal, which is entirely one. And then the person is able to make the entire prayer one, so that even when he has reached the end of the prayer, he is still holding at the beginning of its very first word.

2This is the meaning of: MaNTZPaKh was declared by the seers (Shabbat 104a). [As the Talmud] concludes there, the seers fixed which one is at the beginning of the word and which is at the end of the word.< {MaNTZPaKh, Rashi explains, refers to the double-letters (see Megillah 2b). This is prayer, which becomes “doubled” when one reaches the end of the prayer and is still holding at the beginning of the prayer, as explained above. And this is MaNTZPaKh, the aspect of the double-letters.}>

3“The seers” alludes to the Master of the Field when his eyes are in the aspect of “Seers Field.” He can then look upon and fix those that are close to the ultimate goal, so that when they reach the end of the prayer they are still “at the beginning of the [first] word.” And [he can also look] into those who are far from the ultimate goal. They correspond to “the end of the word,” because when they are at the end of the word, they are literally at the end of the [last] word. But the seers fix them and bring them to the ultimate goal, as explained above. <This is the meaning of “they fixed which one is at the beginning of the word and which is at the end of the word”—i.e., [the seers] fixed them so that when they would reach the end of the word, they would still be holding at the beginning.>

4This is also the meaning of “they forgot them, and they restored them.” Because [these souls] were far from the ultimate goal, and so failed to unite their prayer in the aspect of oneness, they forgot the beginning of the word. [Thus the seers] “restored them” and fixed them, so that [their prayers] should be entirely one, as explained above.