If we seek a reason for this degree of Tzimtzum, we could answer: “And God saw all that He made, and behold it was very good” (Genesis 1:31) – we cannot speculate about this, for it is outside the bounds of our knowledge, as explained earlier (see Openings 14-15). Nevertheless, it is possible to give a satisfactory answer even to this, namely that the Supreme Will knew that turning evil back to good would only be applicable under a graded, measured order and not under some other kind of order.
...that the government of the universe should follow its course until the end. For under the present order, everything is based on choice, reward and punishment, with all the associated flaws and defects. This is certainly the result of the Tzimtzum, where the origins of strict judgment lie rooted. Afterwards Eyn Sof, blessed be He, will want to bring the evil back to good through the revelation of His unity. However you should not think that the latter is a new path that will come into existence only later. The underlying principle here is: “There is nothing at all new under the sun” (Ecclesiastes 1:9). From the very outset everything was prepared in this way. Eyn Sof, blessed be He, calculated the entire governmental order the way it would truly be from beginning to end. Even though the repair itself appears to be the very opposite of the Tzimtzum and what resulted from it, the truth is that He calculated it this way from the very outset and produced the Tzimtzum accordingly.