…until in the very end everything will return to the essential nature of Arich Anpin. Since Arich Anpin is complete Kindness, why should it execute Justice? The intention is that since Arich Anpin is complete Kindness, it will not execute Justice, but its branches have the power to do so. Arich Anpin therefore uses this intermediary in order that something will exist that can execute justice, since this is not Arich’s own intrinsic attribute. However the intention is not that things should stay this way. On the contrary, since it is really Arich Anpin acting, even though at first it may appear that Arich is willing for Justice to be done, the intention is that in the very end Arich Anpin alone will rule and govern everything with Kindness.
Arich Anpin Remembered
Kalach Pitchei Chokhmah 91:8