Sree Narayana Guru (1855-1928) was a spiritual leader and social reformer who led powerful movements to promote social equality. Not Many, But One brings together his work in two rich volumes of translation and interpretation, pieced together for a modern readership. In Volume 1, we see Sree Narayana Guru's philosophy of Advaita. He foresees the potential and the need for a new approach to science and technology. As a result, he discovered new dimensions of Advaita and revived it in a manner that suited the most sophisticated developments in physics and modern cosmology. This volume is a study of the works and teachings of Sree Narayana Guru on a spiritual and scientific footing. In his work, one can see a deep-rooted correlation of Advaita and quantum cosmology. The translations, explanations and commentary given are simple and conceivable by ordinary readers who may not be well equipped to grasp the complexities of the intuitional spiritual findings of Advaita and hypothetic conclusions of quantum physics-but without compromising on the authenticity of the works. Vedic philosophers, physicists, cosmologists and enthusiasts of science and spirituality will appreciate this enterprising effort-though with limitations-in bringing closer two hitherto uncompromising schools of thought. The devotees of Sree Narayana Guru will find an opportunity to delve deeper into his work.