Correspondingly, in the vision, the Tzimtzum appears in one place, while all around it is Eyn Sof, blessed be He. In other words, His power to create creatures – one among all His other powers – appears in one place. All around it are all His other powers, endless and without limits. His aspect of limitlessness is removed from one place only, and this is what is subject to the contraction.
Part 2:...the Eyn Sof, blessed be He, willfully set aside His limitlessness... It is already clear to us that the Supreme Will in Himself is beyond all limits. Accordingly, we must not think that He created only what He was able to create and that he was unable to create any more than this. He is certainly capable of much more, but He did not want to do more. He acted not in His aspect of omnipotence and limitlessness, but with precisely the degree of power that He calculated to be perfectly suitable to accomplish the intended purpose of His action. Thus we see that even though in Himself He is without limits, He set aside His limitlessness in order to bring about the creation. Accordingly, we may say that the power that is the cause of creation already lacks the aspect of limitlessness, which has departed from it.