Satyarth Prakash (Light of Truth) is a monumental work by Maharishi Dayanand Saraswati and a pivotal text in the history of modern India. More than just a religious treatise, it's a revolutionary manifesto challenging deeply entrenched societal norms and advocating a return to the pristine principles of the Vedas. This article delves into the core tenets of Satyarth Prakash, exploring its profound vision, its impact on the socio-religious landscape of 19th-century India, and its enduring relevance in the 21st century.