This means that one should include life from the tree of life, which is Zeir Anpin, in this place, which is Malchut, who is called a “woman.” One without the other, Zeir Anpin without Malchut, does not work. One should include the quality of day in the night, since life, which is illumination of Hochma, is present only on Malchut.
Explanation: A “woman” means the kingdom of heaven. “That you love” means that the acceptance of the kingdom of heaven should be as it is written, “And you will love the Lord your God.” “Day” is called “right line,” which is “For he desires mercy,” and he is content with his share, and “night” means a deficiency. “Know-Him” means that all the work is to unify the HaVaYaH.