You will, moreover, see later that the soul itself comes literally from the four worlds of Atzilut, Beriyah, Yetzirah and Asiyah, and no soul is perfect without the four parts of Neshamah-of-the-Neshamah, Neshamah, Ruach and Nefesh. These are not all one and the same thing descending level by level. For each one is a unique power different from all the others, and each has its own function. The Nefesh sustains the body through the liver.
The Ruach ascends and descends, causing all the different feelings and sensations. The soul sits in judgment over the intelligent thoughts in the mind and brain. If so, we see that Atzilut, Beriyah, Yetzirah and Asiyah are all causes that join together to produce one whole, this being the separate creations (נפרדים, nifradim) in their entirety, or the soul in its entirety. If so, they are not a scale.
Since they all join together to produce one entire whole, we may infer that they are all one system which requires all these things in order to be complete in all its parts.