Light on Sant Mat as its name would imply deals with the basic concept of the Radha Soami faith popularly known as Sant Mat and its various aspects. The teachings are presented in the form of discourses by maharaja charan Singh ji the present satguru at Beas and by means of letters addressed by him to different persons. With his permission these discourses and letters have now been compiled for the benefit of seekers and satsangis. The book is divided into two parts. Part one contains a condensed translation into English of discourses (satsangs) delivered by Maharaj Ji in Punjabi. The original shabds or hymns of the respective Saints have also been rendered into English verse for the benefit of the readers. Professor Jagmohan Lal and Janak Raj Puri and Diwan Daryai Lal retired judge taken great pains in collecting these discourses and putting them into their present form and language. The society is highly indebted these satsangis brothers for their labor of love. Part two contains excerpts of letters concerning Sant Mat written by Maharaj Charan Singh Ji in reply to satsangis seekers from abroad personal matters discussed in some of these letters have been deleted by him as he took care to ensure that only subject matter dealing with Sant Mat and of interest to all readers should appear in these letters. Miss Louise Hilger a satsangi from the United states of America is solely responsibly for typing and compiling the manuscript and giving it he shape of a book a laborious task but carried our willingly during her periodical visit to the colony last winter. We are grateful to her for giving the book its present shape. It is hoped that light on Sant Mat will be read with interest and profit by persons interested in spiritual science including seekers and satsangi brothers and sisters in India and abroad.