Likutei Moharan 51:2/ליקוטי מוהר"ן נ״א:ב׳

12. The emergence of falsehood, which is evil, which is impurity, results from a distancing from oneness.

2This is because evil is a contrariety; as, for example, whatever is contrary to a man’s will [he sees as] evil. But in a state of oneness, contrariety has no place. Rather, everything is good.

3This is the explanation of what our Sages taught: “On that day, God will be One…”—it will be entirely “Who is good and beneficent” (Pesachim 50a). This is because where there is oneness, evil has no place. Consequently, “Truthful speech abides forever” (Proverbs 12:19) will be fulfilled in the World to Come. For then all will be one, all will be good.

4Truth is one. For example: Saying of a silver vessel that it is a silver vessel is the truth. But saying that it is a gold vessel is false. We see that the truth is one, because the only true statement one can make [about its substance] is that it is a silver vessel. Nothing more. Falsehood, on the other hand, is manifold. It could be said that it is a gold vessel, or a copper vessel, or any other designation. We see then that falsehood is the aspect of “they chased after many intrigues” (Ecclesia st es 7:29) .

5{“The wolf will dwell with the lamb, and the leopard with the goat…. They will do nothing evil or vile in all My sacred mountain, for the land will be filled with the knowledge of God…” (Isaiah 11:6,9).}. Because of this, the evil and the contrariety and the tears will be eliminated in the World to Come. As it is written, “They will do nothing evil”—i.e., evil will be nullified; and it is written, “The wolf will dwell with the lamb, and the leopard with the goat”—i.e., the aspect of the elimination of contrariety. And it is written, “God the Lord will wipe away the tears from every face” (Isaiah 25:8)—i.e., the elimination of tears, which are the aspect of falsehood, as explained above. For then it will be “God is One and His Name is One,” because He is entirely good and entirely truthful.

6Impurity will therefore be eliminated in the World to Come, as is written (Zechariah 13:2), “I will remove the spirit of impurity from the earth.” For then all will be one, as is written (Job 14:4), “Who can turn impure into pure, not one!” {This means: The very hold which purity and impurity have derives from a di st ancing from oneness.}