Likutei Moharan 96:2/ליקוטי מוהר"ן צ״ו:ב׳

12. This is the explanation of the [opening] verses: {“The wicked man plots again st the tzaddik, he gnashes his teeth at him. The Lord laughs at him, for He sees that his day is coming. The wicked have drawn the sword… Their sword will pierce their own heart, and their bow will be broken.”}

2The wicked man plots—This alludes to the foreign thought.

3again st the tzaddik, he gnashes his teeth at him—That is, he wants to elevate it.

4The Lord laughs at him, for He sees that his day is coming—He has yet to attain the level of this foreign thought. However, what is the source of the foreign thought that comes to him? [The verse] explains:

5The wicked have drawn the sword—Rashi comments: “sword” connotes conflict—i.e., opposition is stirred up against some tzaddik.

6Their sword—This alludes to the foreign thoughts relating to that opposition.

7will pierce their own heart—That is, the heart of this tzaddik. And because he wants to elevate it, on account of the strength of this desire…

8and their bow will be broken—In other words, the aforementioned opposition.