The provided text is the preface to a biography of Swami Vivekananda, highlighting his transformation from a seeker of personal meditation to a global spiritual leader. It recounts how his master, Sri Ramakrishna, directed him to serve humanity rather than remain in solitary bliss.

The author emphasizes that Vivekananda’s core message is "Strength"—a dynamic power essential for overcoming individual and national suffering. Though his period of active work was brief, his impact was "meteor-like," bridging the East and West. This short biography aims to provide a glimpse into his versatile genius for those unable to read longer works, utilizing authentic materials from the Advaita Ashrama to inspire a "sinking nation" and "drooping souls" with his message of courage.