This collection of teachings by Swami Vivekananda explores the science of meditation as the primary tool for achieving spiritual freedom and self-realization. The author describes the human mind as a restless, "maddened monkey" that must be disciplined through concentration and detachment to reveal the divine nature hidden within. By utilizing the methods of Raja Yoga, practitioners learn to calm the "waves" of the mind, eventually reaching a state of Samadhi where the distinction between the individual and the infinite vanishes. The text emphasizes that purity, chastity, and perseverance are essential prerequisites for success on this path. Beyond mere quietude, meditation is presented as a scientific me ...