Likutei Moharan 21:12/ליקוטי מוהר"ן כ״א:י״ב

112. Eternal life belongs solely to the Holy One. For He lives forever. And someone who is encompassed in his root—i.e. in Him—he, too, lives forever. By virtue of his being encompassed in the One, and being one with God, he lives an eternal life like the Holy One. Similarly, perfection belongs solely to God. Other than Him, everything is lacking. But someone who is encompassed in Him [also] possesses perfection.

2Now, the quintessence of encompassment, being incorporated in the One, is through knowing Him. As the wise man said: “Were I to know him, I would be him.” For principally, man is the intellect. Therefore, wherever the mind is focused, that is where man’s entire being is. Thus, when he knows and comprehends Godly knowledge, that is where he is, literally. The more he knows, the more he is encompassed in the root, i.e. in the Holy One.

3Further, whatever a person lacks—be it livelihood, children, or health, or any of the other lacks—has entirely to do with a lack of knowledge. And even though there are those who are completely lacking in knowledge and yet possess the best of everything, in truth, whatever they have is nothing at all. The inverse is also true: The person with perfect knowledge who has some lack, in truth, this lack is nothing at all. As our Sages said, “[If] you have acquired knowledge, what are you lacking? But if you are lacking knowledge, what have you acquired?” For principally, lack and perfection are dependent upon knowledge.

4Similarly, anger and cruelty stem from a lack of knowledge. As it is written (Ecclesia st es 7:9), “Anger rests in the bosom of fools.” This is also why a sick person is contentious, because he is then under the influence of judgments. The judgments—which are a smallness of intellect—descend upon him, and this is why he is angry.”

5But in the future world, knowledge will be revealed and everyone will know God, as in, “For the earth shall be filled with knowledge of God.” And therefore, anger will then be eliminated, as in (Isaiah 11:6-9), “And the wolf shall dwell with the lamb, and the leopard shall lie down with the kid…. And the cow and the bear… they shall neither harm nor destroy… for the earth shall be filled with knowledge of God….” For presently, because of the trait of anger, it is impossible for the wolf to dwell with the lamb. But in the future, as a result of the elimination of anger by means of the knowledge that will be revealed then, they will be able to coexist.