...and they were called the three worlds of Beriyah, Yetzirah and Asiyah. As already mentioned earlier (Openings 31 & 38), everything which is given power and control by itself acquires its own name and reveals its powers separately. However, when it is secondary to others, it is not called by a separate name but is considered as merely a small part of the others in which it is included.
Part 2: For Atzilut, as arranged with its proper repairs and adornments... In order to perform its functions, it requires everything that is in it, and also that it be clothed in its garments....is the root of everything... For the function of Atzilut is the initial preparation of everything that has to exist with all their different levels and all their various institutions and repairs.