Part 1: The Sefirot shine with two kinds of direct and returning light. This means that in the prophetic vision, these two kinds of direct and returning light are seen.
Part 2: (1) After the descent of the Sefirot level by level from Keter to Malchut, Malchut in turn becomes Keter, and so on in the same way until Keter becomes Malchut. In the vision, this looks exactly “like the appearance of lightning” (Ezekiel 1:14). A flash of lightning looks as if it comes out from one side and travels over to the other side, then immediately afterwards, it appears to turn from the other side back to the side from which it came. Similarly, all the ten Sefirot, in every place where they are, appear in this way whenever they are seen. Keter emerges first from the Source, and the levels descend one by one to Malchut. Afterwards, Malchut itself is seen to be Keter emerging from Eyn Sof.