כִּ֣י נֶ֣פֶשׁ הַבָּשָׂר֮ בַּדָּ֣ם הִוא֒ וַאֲנִ֞י נְתַתִּ֤יו לָכֶם֙ עַל־הַמִּזְבֵּ֔חַ לְכַפֵּ֖ר עַל־נַפְשֹׁתֵיכֶ֑ם כִּֽי־הַדָּ֥ם ה֖וּא בַּנֶּ֥פֶשׁ יְכַפֵּֽר׃
因為肉體的生命在血中。我把血賜給你們,放在祭壇上,為你們的生命贖罪;因為血憑著其中的生命才能贖罪。
Tanya
So to explain this idea, based on what Rabbi Chaim Vital ob"m writes in Shar Hakdusha (and in Eitz Chaim-Shar 50 Chapter 2), that every Jew, a Righteous person (Tzadik) and a wicked person (Rasha), has two souls, as it is written (Yeshayahu 57 16) "and I have made 2 souls", and these are the two souls. The first Soul is from Kelipa and the other (unholy) side, and it is enclothed in a person's blood to give life to the body, and as it's written (Leviticus 17,11): ''for the Soul of the flesh is in the blood''. and from it (the soul) comes all bad character traits, from the four evil elements within it. Which are: anger and arrogance from the element of fire which rises. and desiring pleasures are from the element of water, for water plants all sorts of pleasure. And licentiousness and frivolity and boasting and empty things from the element of air. And laziness and sadness from the element of earth.