Likutei Moharan 177:4/ליקוטי מוהר"ן קע״ז:ד׳

14. May His great Name yitgadal (be exalted) and be sanctified.

2YiTGaDaL—is TaGiY DaL. That is: tagiy is Keter (Crown); dal corresponds to yAaKoV, for he is AKeV (heel), an aspect of dal (poor). Moreover, the aspect of yiSRael corresponds to tagiy, for “SaRita (you have become ennobled) before God” (Genesis 32:28).

3and yitkadash (be sanctified)—is TK ShaDaI.

4RaBA (great)—is B’ӔR, and satisfies the will of every living being. {This entire teaching was recorded only in outline. At the time these awesome concepts were taught, we were not worthy to have Rebbe Nachman explain them to us clearly, the way he was wont to do. Rather, he delivered them quickly, in general terms. He alluded here to all the kavanot (inner intentions) of Kaddish, which are explained in the Kavanot of the Ari, of blessed memory. Yet none among us knows the way to explain these teachings.}