'The Key of Knowledge' has been out-of-print since 1928. This book makes possible to explain the strange similarities and identities between the esoteric teachings of all religions. This is indeed a magnum opus on Theo-logy-on Jaina Principles, Hinduism, Christianity and Islam. The originality of thought of C.R. Jain is bound to have a lasting influence. The reading of the works of the author is a pleasure from the literary point of view. Not reading this book would be missing a life time experience because it is a key with the aid of which the locked doors of wisdom might be unlocked, enabling you to enter into them and see for yourself the priceless treasures which have remained hidden from the common view so long.
The sacred books of Hindus, Christians, Jainas, Muhammadans, Parsis and Jews went on allegorising the doctrines of spiritual the doctrines of spiritual science. Most of the allegories hide their true meaning from the common man but have been decoded by the author providing really an ocean of wisdom.