...for these are the ones that perform the channeling... This is obvious, for the function of the Yesod is only as “a river coming out from Eden” (Genesis 2:10) – drawing the influence to the necessary place.
...and all the different parts of the Partzuf are drawn to them to flow forth in accordance with their law. For the Yesods are aroused first, and they draw forth influence from all the different parts of the Partzuf commensurate with their arousal. The other limbs draw down influence from Eyn Sof, until everything is drawn down to the Yesod, as will be discussed later in its appropriate place. All this is clearly visible in the human form. And since the entire channeling of influence depends upon the Yesods and the other limbs are subject to them in this respect, it is sufficient for the difference to be in the Yesods in order to bring about the necessary difference in the government.