Few scientists would attempt to question the theory; To reveal to him the philosophy behind it. Eddington is one of those few. Eddington, the famous astronomer, mathematician, and physicist, was the first to prove Einstein's theory of general relativity, the first to write about it in English. Einstein himself praised him when he said that what he wrote was the most accurate thing written about relativity in any language. He contributed to the development of non-Euclidean geometry, which helped greatly in providing a valid geometry for understanding the world in light of the theory of relativity itself. He did not stop there, but he had many of his own studies on the origin, development, movement, and structure of stars. Eddington lived through the two biggest revolutions in modern science (the theory of relativity and quantum theory). In this book, Eddington does not content himself with monitoring the philosophies that led to the two theories or the philosophies that resulted from the two theories, but rather tries to draw a complete general picture of the universe scientifically and philosophically. Rather, his ambition does not stop there. We find him trying to adhere to the theory of everything with enthusiasm, perseverance, and courage