Tall and athletic, a warm and gentle soul with a wry sense of humor, Bohr was universally admired. He always spoke in a self-effacing near-whisper. “Not often in life,” Albert Einstein wrote to Bohr in the spring of 1920, “has a human being caused me such joy by his mere presence as you did.” Einstein was charmed by Bohr’s manner of “uttering his opinions like one perpetually groping and never like one who [believed himself to be] in the possession of definite truth.” Oppenheimer came to speak of Bohr as “his God.”
