SATYARTH PRAKASH HINDI सतयर is a book written originally in Hindi by Maharishi Dayanand Saraswati, a renowned religious and social reformer and the founder of Arya Samaj. It is considered one of his major scholarly works, which has now been translated into more than 20 languages including Sanskrit and several foreign languages like English, French, German, Swahili, Arabic and Chinese.

The book is a beacon of light leading people from darkness to light, irrationality to rationality, irreligion to religion, and nescience to science. It contains principles and rules of conduct for everyone and presents a charter of life that is sublime and noble. The book is dedicated to laying down the reformist advocacy of Swami Dayanand with the last three chapters making a case for comparative study of different religious faiths.

Overall, SATYARTH PRAKASH HINDI सतयर is an important book for anyone interested in learning about the teachings of Maharishi Dayanand Saraswati and Arya Samaj. It is a must-read for those who seek to better understand the principles and practices of Vedic heritage.