Kabbalah su Isaia 6:13

And they who are wise shall shine like the brightness of the firmament, and they who turn many to righteousness like the stars for ever and ever" (Daniel 12:3). "And they who are wise" alludes to the souls of the righteous, "the brightness of the firmament" to the illumination of the upper three Sefirot, which are revealed when combined with the attribute of mercy. The atmosphere of the brightness that is most concealed of all concealed things merged with this point and shone into it. Then this Beginning which is Arich Anpin expanded into a head and body, and made a chamber for its honor and glory. There, inside the chamber, Arich Anpin planted a holy seed to bring forth souls for the benefit of the world. This is the secret of, "So the holy seed is its immovable stump".