Thus it is Imma, who governs Zeir Anpin, that brings all this about. When Imma sees that the Nukva is ready for Zeir Anpin, Imma becomes aroused and directs Zeir Anpin using her mitigating influences, causing shining faces and joy everywhere. Blessing and sustenance then flow with abundant joy in the mystery of coupling and union (זיווג, zivug), as will be explained in its appropriate place with the help of Heaven (see Opening 138).
For Malchut was instituted as the container vessel for all of them... This is what brings about the connection and joining both above and below. Above – on the level of Zeir Anpin – all the lights are focused on one place, and the intention in everything is to benefit the creatures of the lower realms and fill them at their roots. The entire will is focused on this, and then everything goes towards this in one flash of excitement. All the different kinds of thoughts and strategies are directed to this one end with the radiant excitement of love.