About the book: A meticulous scientific presentation of the unity of being, (one unified being) presented by the contemporary Aref (Sufi Master) and teacher, Molana Salaheddin Ali Nader Shah Angha (Hazrat Pir). This inspired manuscript presents a fresh view of the essence within as well as beyond the frontiers of almost 12 billion light years of cosmic expansion. Expansion and Contraction within Being (DAHM) deals with the foremost, cutting edge problems of science, including biology, immunology, molecular physics, cosmology, and neurology, to name a few. For example, Hazrat Pir unifies the seemingly various forces of Nature by demonstrating that it is the amount of Expansion and Contraction which is the only factor needed for specifying the dynamic variables of a particle or a system. Hazrat Pir's surge of intuitive knowledge and wisdom, especially in this book, is truly an illumination to the pathways of scientists' search for the truth. This book should be studied deeply by anyone interested in a scientific approach toward understanding the truth of the vast and united Existence.
In the book, "The Epic of Life", by Hazrat Shahmaghsoud Sadegh Angha, he uses the word DAHM to refer to several concepts. These concepts include inspiration-expiration, divine desire, divine attraction, divine love, divine light, and divine wisdom, as well as spiritual and mental expansion and therefore, ascension for intellectual expansion.

According to the "The Epic of Life", the Farsi letter (D) symbolizes the oscillatory motion, which is the most essential motion responsible for the construction of space-time, light, and matter. The Farsi letter (M) symbolizes the continuous, eventually circular, refraction, and thus the descent of light in forming an elementary particle, as well as the circle of possibility, i.e. the whole Cosmos. Therefore, the word (DAHM) symbolizes the Essence of Being.

About the author: Known as Hazrat Pir, His holiness Molana Salaheddin Ali Nader Shah Angha is the forty-second in an unbroken succession of eminent Sufi masters dating back to the seventh century He is the head of M.T.O. Shahmaghsoudi Sufi Order. Hazrat Pir's knowledge is not limited to the esoteric disciplines or sacred sciences, but expands to other disciplines, including physics, mathematics, astrophysics, astronomy, bio-physics, architecture, and philosophy. The author of numerous works in poetry and prose, the school has grown under his tutelage to include over 400,000 students worldwide.