The proposition consists of two parts. Part 1: Abba and Imma must… The Second Israel Sabba-Tevunah are a subdivision of the First Israel Sabba-Tevunah. Part 2: This is because… This explains the reason for this subdivision.
Part 1: Abba and Imma must… divide up their lowest part – which is Israel Sabba and Tevunah… Altogether the main Partzufim make up a total of five, which embody the entire array of the Ten Sefirot of the world in question. (Arich Anpin is Keter, Abba is Chochmah and Imma is Binah, while Zeir Anpin is Chessed-Gevurah-Tiferet-Netzach-Hod-Yesod and Nukva is Malchut.) However, Abba and Imma subdivide their Sefirot into whatever levels are required. Thus Abba, the First Israel Sabba and the Second Israel Sabba are all Abba, except that when certain separate functions and powers are given to his Malchut, we find these two other Partzufim – although Abba is the one that is actually operating. The same applies to Imma in relation to the First and Second Tevunah.