And this Tree is as large as a distance of five-hundred years,xBereishyt Rabbah 15:6 which are Hei ה (=5), (Ex. 15:25)... and the waters were sweetened – this is the latter Hei, of which it is stated: (Ruth 1:20)... call me bitter (marah)...
For the Lower Shekhinah, She is a garden spring that never ceases, a drop that is drawn from the brain, and many drops are drawn from it, which are: (Ps. 45:15)... virgins following her, her companions...
The skull is a ‘rock’ (sel)’a, and the well-spring inside it is the brain. About these drops it is stated: (Ps. 127:5) Happy is the man, who has filled his quiver from them... etc.... the enemies at the gate – which is ‘the gate of the righteous’, the holy sign of the covenant, about which it is stated: (Ps. 118:20) This is the gate of Y”Y, the righteous shall enter through it.