This can be compared to the case of a person who wants to produce something that requires fire but not too fierce a fire. The person must put the exact quantity of wood that will enable the fire to burn with no more than moderate heat. If he adds one extra piece of wood, the fire will burn too strongly, but if he puts one piece too little, the fire will not burn at the necessary heat.
Similarly, the Supreme Mind knew on what level it was necessary for man to be built in order that he would be in the situation described above. He made just as many levels as were necessary, no less and no more, with just so many interconnecting links, no fewer and no more. Of this the sages said: “‘And God saw all that He made and it was very good’ (Genesis 1:31) – A man should not say, ‘If I had three legs...’” (see Bereishit Rabbah 12:1 and Zohar III, 239b). As we will explain in the coming proposition, here it is forbidden to ask for a reason. This is because in order to understand the calculation, it would be necessary to know all that the Supreme Mind knew, and this is impossible.