In accordance with this order, the teachings of the Kabbalah always trace everything to the underlying foundation of the four letters of the Name, blessed be He. This is a very important and necessary principle in the study of this wisdom, because we always speak in terms of the Ten Sefirot, yet there are many Kabbalistic teachings that appear to contradict one another. The main thing to understand is that the various levels divide up into many different ways and into many details depending on what is required for the action they have to execute. The division is not made on the basis of the Ten Sefirot in general but according to the particular nature of the action in question.