Later in life, he joined an Episcopal congregation, and became increasingly religious. He publicly spoke and wrote about the complementarity of science and religion, the afterlife of the soul, and his belief in God. He stated, "Through science man strives to learn more of the mysteries of creation. Through religion he seeks to know the Creator." He was interviewed by the Assemblies of God pastor C. M. Ward, as stating, "The farther we probe into space, the greater my faith." In addition, he met privately with evangelist Billy Graham and with the pacifist leader Martin Luther King Jr.