And about them it is stated: (Is. 40:12) Who has measured the waters with His step – this is Ḥesed,... and the heavens He gauged with a span (zeret)... What is zeret (span)? – this is Gevurah.... and all in a measure (shalish)... – this is the Middle Pillar (Tipheret), which is ‘the third’ sephirah of seven,... and has weighed mountains in a scale... – this is Netzaḥ.... and hills in the balance – this is Hod.
And they are in the mystery of the letter Hei ה (=5), for this point measures 5∞ה points through them the five Alephs. For it is the Yod י that emerges from within ‘the pure air’, which is Higher Keter. And because these five ‘measurings’ are in the mystery of higher Hei, it travels through them – five hundred years between each one.