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.
I do not want to get material life, do not want the sense-life, but something higher. That is renunciation. Then, by the power of meditation, undo the mischief that has been done.
-Swami Vivekananda