Likutei Moharan, Part II 1:9/ליקוטי מוהר"ן·תנינא א׳:ט׳

19. And when prayer is freed from exile and redeemed, all doctoring falls away, because there will be no need for medicine. All medicines are based on plants, each plant receiving potency from its own particular star and constellation. This is as our Sages, of blessed memory, taught (Bereishit Rabbah 10:6) : You won’t find a blade of grass that does not have a star and a constellation striking it and telling it, “Grow!”

2Now, each star and constellation receives power from those higher than it. And the higher one receives from the one higher than it, till they receive power from the ministering angels. This is as is said: All the heavenly bodies borrow from one another; the moon borrows from the sun, etc. (Tikkuney Zohar #44, p.82b). “For there is higher and higher still” (Ecclesiastes 5:7), and they all borrow from one another, till they receive and borrow from the ministering angels. These angels, in turn, receive from those above them, “higher and higher still,” until they all receive from the root of all things, which is the Word of God: “By the Word of God the firmaments were made, and their entire host by the breath of His mouth” (Psalms 33:6). Therefore, when a person merits [perfected] prayer, he has no need for the healing that plants provide, because prayer is the Word of God, which is the root of everything.

3This is the concept of NaVYE (a prophet), which is an acronym for Bidvar YHVH Shamayim Naasu (“By the Word of God the firmaments were made”). The Alef represents the firmament separating water from water (Tikkuney Zohar #5, p. 19b, and #40, p.80a). * Prophecy is the means to prayer, which corresponds to the Word of God, as discussed above.

4This is: “He dispatches His word to heal them; He saves them me’shechitotam (from their destruction)” (Psalms 107:20).

5He dispatches His word to heal them— In other words, all cures are received solely by means of the Word of God, namely, prayer. Thus…

6He saves them me’shechitotam— [SheChiTotam] alludes to plants, as in “harvest leShaChaT (hay)” (Menachot 71a), because there is no need for the healing that plants provide.

7And this is the meaning of: “You shall serve God, your Lord, and He shall bless your bread and your water, and I shall remove illness from your midst” (Exodus 23:25). “You shall serve God”—“service” is prayer (Bava Kama 92b)—“and He shall bless your bread and your water, and I shall remove illness….” In other words, you will be healed through bread and water. As a result of their being blessed from the root of everything—i.e., the Word of God/prayer—bread and water will have the same healing power as the plants.

8The division of the potencies, such that one plant has the power to cure one kind of illness, and another [plant] a different kind of illness, and so on—all this apportioning of their potencies is only in the lower world. But on high, at the root of everything, which is the Word of God, all things are one. Bread and water are no different than plants. By grabbing onto the root—i.e., the Word of God/prayer—it is possible to channel the healing powers into bread and water. Then one will be healed through the bread and water, as in “and He shall bless your bread… and I shall remove illness….”