What does the text identify as the necessary prerequisites for purifying the mind in order to receive Self-knowledge?

Chapter 32 outlines several means for purifying the mind, which is a crucial step before Self-knowledge can be attained. These means include following the teachings of one's mother, father, and teacher, as well as the practices of sacrifice, study, and charity. These are described as the supreme means to transcend birth and death. The text states that without these purifying practices, the precious value of Self-knowledge cannot be grasped, and one's spiritual journey would be useless. This purification paves the way for the Guru's grace to ultimately reveal the Self.