So it is above: Abba and Imma both contain Zeir Anpin’s Mental Powers within them, and their role is to bring them out to the open. However, when Abba does so, he brings them forth as a single, undifferentiated whole. In the case of Imma, however, they are discernible within her even during the Pregnancy and all the more so after she gives birth to them.
…like seed in the brain of the father. For the seed originates in the brain, where it is included as a single whole. And even when it comes forth, it does so as an undifferentiated whole.