This Upanishad belongs to the Atharva Veda. As the name of the Upanishad suggests, the teachings revealed in it are such as to leave its students clean, like a shaven head (mundaka), rid of the veil of ignorance. The lucid translation of the text along with Shankaracharya's commentary on it is an additional aid to comprehend the profundity of the subject.
Love is always mutual and reflective. You may hate me, and if I want to love you, you repulse me. But if I persist, in a month or a year you are bound to love me. It is a well-known psychological phenomenon.
-Swami Vivekananda