This is a hymn that expounds Self-Knowledge and is addressed to Vishnu, the all-pervasive, the sustainer of the manifest world. It was composed by Hastamalaka, an immediate disciple of Adi Sankaracharya. The primary text presented in this book is Hastamalakiyam, which means a work by or pertaining to Hastamalaka. It consists of twelve verses that succinctly reveal the Knowledge of the Self, proclaiming the identity of this eternal Knowledge and the Being of the Self. The term translated as "Knowledge," which appears in the fourth line of each of the first eleven verses, can also be interpreted as "Awareness," for Consciousness, itself, is the Knowledge that is eternal. Also included in the present volume are an English translation of the Tamil version of the text by Bhagavan Sri Ramana Maharshi and an English translation of Hastamalakiya-Bhashyam, which is the Sanskrit commentary by Adi Sankara upon these verses by his disciple.