Why this word is great
YECHIDAH — [Noun] In Kabbalistic thought, the highest aspect of the soul, embodying its indivisible unity with the divine. From Hebrew יְחִידָה (y'khidá, "unity"), derived from יָחִיד (yachid, "the only one, unique, singular"). Unlike "nefesh" (the animal vitality that animates flesh) or "ruach" (the restless wind of emotion), yechidah is the still point where self dissolves into the infinite. It is the silent flame in the core of a candle, the unbroken note beneath all music, the single thread woven through every tapestry of existence—not a part to be named, but the whole that cannot be spoken.