The absolute Other (in the form of the superego) is there in order to guarantee that there will always be a lack on the other side (the side of the subject); that this lack will never ‘run out’, and that ‘it’ (the act) will never succeed. If an accomplished (or ‘successful’) act is always related to the dimension of the ‘lack that comes to lack’, the superegoic version of the (moral) law focuses on preventing the act from even taking place. But the only real guarantee that can be fabricated to prevent the act from even taking place is the advent of the figure of an absolute Other. If there is ‘an Other of the Other’, the very possibility of the act is excluded by definition. And such an exclusion, in spite of the humiliation and torment that the subject must endure at the hands of this Other, is, in fact, pacifying. -Zupancic

Jujutsu With Zizek