This document summarizes Sri Sankaracharya's teachings on direct realization and the nature of the self from his book Select Works. It discusses qualifications needed for spiritual inquiry such as detachment, discrimination, and faith. It then describes the process of inquiry where one questions if they are the body or senses and realizes they are the eternal, pure self. Through reasoning and scriptural evidence, it rejects identifying the self with the impermanent body and establishes that one's true nature is the infinite, secondless Brahman.