Sefer Etz Chaim and Tanya

Both texts discuss birur (clarification/separation of good from shells) and klipat-nogah (the veil of impurity that can be refined). Text 1 (Etz Chaim) emphasizes birur through the lens of the Ten Martyrs' deaths as a necessary cosmic refinement—their physical bodies containing klipat-nogah waste that required violent separation to elevate their souls (מפאת גופם...שלטה בהם סט"א). Text 2 (Tanya) frames birur as a psychological-spiritual process where the divine soul transforms the animalistic soul's desires by removing "filthy garments" (הבגדים הצואים), emphasizing internal transformation rather than external violent separation. Both accept that klipat-nogah contains trapped good requiring refinement, but Text 1 focuses on cosmic structural necessity while Text 2 emphasizes individual spiritual work and desire transformation.