Answer: A mother symbolizes the female desire, the desire to receive, which is a deficiency of spirituality. And his wife symbolizes the next level of this desire. Later, a male becomes detached from his mother, like a little child, and adheres to a greater desire, which is called his wife. Therefore it is said, “in all that Sarah saith unto thee, hearken unto her voice” (Genesis 21:12).
From the Kabbalah Lesson in Russian 6/9/16