For you have borne the Shekhinah in standing prayer. Stand upon your feet of which it is stated: (Ez. 1:7) And their feet... as the hoof of a calf (’egel)... Circular (’igul) – like vowel-points, which are the ‘conductors of the letters,’ and from the aspect of the letters, they are square. It is this that is written: (Ez. 1:17) When they went, they went upon their four sides...
And furthermore:... upon their four sides... – these are
the four ‘Sanctifications’ (Qedushah), that a person says each day.