In this booklet, published on 27th July 1923 [August 1960 presented here], the author discusses that Allah sent prophets to all nations of the world with the aim of building a connection with God and to bring about a spiritual upliftment of mankind. We are indebted to the Holy Prophet Muhammad (pbuh) who brought about a complete spiritual transformation in Arabia and laid the foundation of world peace by preaching acceptance of all prophets and messengers of the past and their revealed books.