21. In the hollow space of the skull, there exists a tissue made of air of concealed upper Chochmah that is not detachable. THAT IS TO SAY, IN THE CRACKS OF THE SKULL THERE IS THE BRAIN OF AIR OF SUPERNAL CHOCHMAH AND UNDERNEATH THAT THERE IS AN UNBROKEN MEMBRANE. It is not common THAT IT IS BROKEN and it never opens. This membrane covers the brain, which is concealed Chochmah OF ARICH ANPIN. IN ARICH ANPIN THERE ARE THREE HEADS, BESIDES THE ONE HEAD THAT IS ATIK. THESE ARE THE SKULL AND THE UPPER CONCEALED CHOCHMAH, WHICH IS REFERRED TO AS THE BRAIN OF AIR THAT IS IN THE CRACKS OF THE SKULL, WHICH IS THE SECOND HEAD. THE LOWER CONCEALED CHOCHMAH IS IN THE HOLLOW OF THE SKULL, WHICH IS THE THIRD HEAD. THE MEMBRANE IS LOCATED UNDERNEATH THE BRAIN OF AIR AND ABOVE THE CONCEALED CHOCHMAH, AND COVERS THE CONCEALED CHOCHMAH SO IT SHOULD NOT RADIATE ITS ILLUMINATION TO THE OUTSIDE OF THE MEMBRANE. THIS IS WHY THIS CHOCHMAH WAS COVERED WITH THE MEMBRANE THAT IS IMPENETRABLE.
22. This brain, which is the concealed Chochmah, THAT IS THE THIRD HEAD OF ARICH ANPIN, is still and quiet in its location like fine wine above its sediments. That is why they say an old person's mind is vague and his brain is veiled and not agitated.
23. That membrane is detached from Zeir Anpin. Therefore, his brain spread out to 32 paths. It is written: "And a river went out of Eden" (Beresheet 2:10). Why so? Because the membrane gets broken and does not cover the brain. We have learned that from the letters' impressions, like THAT Tav, impressed upon Atik Yomin, ARICH ANPIN, the incomparable.