From this you can understand why it is so appropriate to refer to the Sefirot as “emanated light” (אור נאצל, ohr ne’etzal). For on the level of what the (spiritual) eye can see, light was emanated to our eyes – a light that could be seen. This was not the case at first. And if permission were granted to the eye to see, we would come to recognize that everything has one root: Eyn Sof, Who cannot be seen. There is one light that exists through Him on a level such that it can be seen, and this is the light of the Sefirot. If so, let us call it a light that emanated from Ayin (אין) – from “No-thing”, i.e. from that which cannot be conceived.