Sefer Etz Chaim and Tanya

Both texts discuss birur (separation/clarification) of good from evil within klipat-nogah. Text 1 (Etz Chaim) emphasizes the complete separation and permanent removal of evil (השעיר ויצא לגמרי אל הקליפה הגמורה) with good returning to holiness, stressing the irreversible bifurcation of mixed elements. Text 2 (Tanya) emphasizes transformation (הָרָע נֶהְפַּךְ לִהְיוֹת טוֹב) of the evil itself into pure good by removing its "filthy garments," focusing on redemption of the fallen sparks. Text 1 stresses separation and loss for klipat-nogah; Text 2 stresses transformation of evil into good. This is a difference in interpretive emphasis regarding the mechanism of birur rather than direct contradiction, as both involve clarification and elevation.