One should not seek a reason for all of these, because the overall reason is that they are all required to produce this composite entity with his unique nature precisely the way it is. Man’s eternal nature has to be this way in order that he may serve and attain perfection, as discussed earlier and as will be discussed further later on.
...is the first foundation of the government instituted by the Emanator, blessed be His Name. For everything that we discuss in relation to the Sefirot concerns only the laws by which the worlds are governed. All these laws are revealed by means of lights. The first of all the laws is this basic principle. This is the first light, and this is Keter, as will be discussed below. (The reason for all the different parts of the creation is embedded in the Sefirah of Keter.)