Likutei Moharan, Part II 82:4/ליקוטי מוהר"ן·תנינא פ״ב:ד׳

14. Now, when things don’t go for a person as planned, this is opposed will: I want it to be like this, but it is the opposite, [it is] unorderly. This is the concept of warfare, for all war is opposed will, the concept of disharmony.

2{“When you go out to war against your enemies and God your Lord delivers them into your hand, and you take some of them captive.} This is: When you go out to war— when things go for you not as planned, i.e., opposed will.

3and God your Lord delivers them into your hand—that all wills are eliminated in face of your will, so that things go for you as planned, in accord with your will. When is this? It is when…

4and you take some of them captive—it is when you attain the concept of MaH, when you draw Godliness to yourself—HaVaYaH filled in with the letter aleph. And this is the meaning of MaChaShaVaH (thought)—ChaShoV MaH (Zohar I, 24a; Tikkuney Zohar #69, p.112b), when you constantly bind His Godliness in your thoughts. And this is the concept of “a King bound in the ReHaTim (tresses)” (Song of Songs 7:6)—inside the RaHaTei (rafters) of your mind (Tikkuney Zohar #6, p.21b).

5Thus, this is “and you take some of them captive.” You should draw MaH into your thoughts, binding His Godliness in your thoughts. For anything which is drawn down from a high place is called “captive,” as it is written, “You ascended on high, you took a captive” (Psalms 68:19). As a result all wars and all the wills opposed to your will are eliminated.

6This esoteric teaching is alluded to in Etz Chaim, in the Introduction : Principle #19, and in the Kabbalistic meditations for Rosh Chodesh Elul.