…for Zeir Anpin’s sake… This is done only to bring the Mental Powers to the right level, as the proposition states below.
…at times… For it is not so all the time. Only in the First Maturity do the Partzufim of the Second (or “Secondary”) Israel Sabba and Tevunah operate, while in the Second Maturity it is the Partzufim of the First (or “Primary”) Israel Sabba and Tevunah that operate.
…into a further subdivision. In other words, Malchut of Israel Sabba-Tevunah becomes a separate Partzuf – the Second Israel Sabba-Tevunah.