Kabbalah su Genesi 17:21

It also says “he defiles the land” meaning that he defiles the supernal land. The reason is that the supernal land only receives abundance from the supernal Tzaddik, and the Tzaddik only bestows to her, and when man heats himself up for no reason he causes that the supernal brit (the Tzaddik) will be forced to bestow the supernal good abundance to the external forces. The secret of its establishment (of the brit) in the secret of (Genesis 17:21)“I (God) shall establish My covenant, Isaac”, is by the awakening of Torah and good deeds to bestow to her (Shechinah, Malchut) the supernal white Light. Whilst he is “Bal Keri” (someone who is impure because of the release of sperm) that he is heated by the Lamed Yud Angel and her forces, it is also for waste, and anything wasteful or empty is the external forces like the nations that bow down to nothingness and emptiness. But it turns out that the abundance that was supposed to be received by the mistress (Shechinah, Malchut) is received by the maidservant (the Klippot). As said in Proverbs 30:23 “A maidservant, when she displaces her mistress.” And the mistress receives the left-overs which is the harsh judgment of the left side. Thus, “he defiles the land” and whoever knows the secret of the Supernal Zivug knows how grave this sin is.

Come and behold: When there is a righteous person in the world, the Shechinah immediately attaches Herself to him and never leaves him. And She therefore desires him. The upper desire is then aroused toward Her with love that is similar to the desire of a man for a woman when he feels jealousy toward her. That is why it is written: "But with you will I establish My covenant." My desire is aroused because of you. The verse, "My covenant will I establish with Isaac" (Gen. 17:21), has a similar meaning.