Part 2: It was therefore necessary for 288 sparks to descend from here... Very many sparks were in the process of descending with the vessels, as explained at length in the Kabbalistic sources. Afterwards, however, it was necessary to make a specific number of them so that they would come to a total of 288. For if not for this, it would have meant either that there was no need for any specific number at all, or that all the sparks that descended would have been counted as one, or that the first levels in each name would have been counted.
But the essential principle is that it was in these sparks that fell that this matter of the four names of AV had to be revealed, and then all those levels were sorted and purified in the way explained in its appropriate place, until eventually these four names of AV remained in control, and all the others were included in them. And the truth is that the names of AV themselves radiate in a specific way in each name in accordance with the nature of that name, in order to lift them up above the damage, each one according to what befits it.