The scientist who seeks to learn the origin, history, nature, and laws of the physical universe and the psychologist who probes into the working of the human mind--both must at some point of their investigation consider the questions "Who Am I?" side by side with "What Is the World?" Next they cannot afford to ignore the mystery of the Deity. Finally it will be found at some point on their way that they need to impose a self-discipline and an ethical code upon themselves.
-- Notebooks Category 7: The Intellect > Chapter 6: Science > # 140