Satyarth Prakash was written in 1875 , originally in Hindi by Dayanand Saraswati, an influential religious and social reformer and the founder of Arya Samaj. It is considered one of his major scholarly works. The book was subsequently revised by Swami Dayanand Saraswati in 1882 and has now been translated into more than 20 languages including Sanskrit and several foreign languages like English, French, German, Swahili, Arabic and Chinese. The major portion of 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.