“Fundamentally, however, there is neither good nor evil; this is all based on human concepts. In the universe there exists neither good nor evil, because everything has been created in accordance with immutable laws. the divine principles are reflected in these laws, and only through knowing these laws will we be able to get close to the divine.”

Source: Reason: The Only Oracle Of Man (1784), Ch. IV Section II - Containing a Disquisition of the Law of Nature, as it respects the Moral System, interspersed with Observations on Subsequent Religions.

Source: The House of Hades

Source: Attributed in posthumous publications, Einstein and the Poet (1983), p. 132
Variant transcription from "Death of a Genius" in Life Magazine: "I cannot accept any concept of God based on the fear of life or the fear of death, or blind faith. I cannot prove to you that there is no personal God, but if I were to speak of him I would be a liar."
Context: About God, I cannot accept any concept based on the authority of the Church. As long as I can remember, I have resented mass indoctrination. I do not believe in the fear of life, in the fear of death, in blind faith. I cannot prove to you that there is no personal God, but if I were to speak of him, I would be a liar. I do not believe in the God of theology who rewards good and punishes evil. My God created laws that take care of that. His universe is not ruled by wishful thinking, but by immutable laws.

River out of Eden (1995)

Progress In Religion (2000)
Context: I am neither a saint nor a theologian. To me, good works are more important than theology. We all know that religion has been historically, and still is today, a cause of great evil as well as great good in human affairs. We have seen terrible wars and terrible persecutions conducted in the name of religion. We have also seen large numbers of people inspired by religion to lives of heroic virtue, bringing education and medical care to the poor, helping to abolish slavery and spread peace among nations. Religion amplifies the good and evil tendencies of individual souls.

Source: Rudimental Divine Science, p. 1

Source: Man, the State, and War (1959), Chapter VI, The Third Image, p. 163

Rome, or Reason? A Reply to Cardinal Manning. Part I. The North American Review (1888)
Context: Among the “some two hundred and fifty-eight” Vicars of Christ there were probably some good men. This would have happened even if the intention had been to get all bad men, for the reason that man reaches perfection neither in good nor in evil; but if they were selected by Christ himself, if they were selected by a church with a divine origin and under divine guidance, then there is no way to account for the selection of a bad one. If one hypocrite was duly elected pope—one murderer, one strangler, one starver—this demonstrates that all the popes were selected by men, and by men only, and that the claim of divine guidance is born of zeal and uttered without knowledge.

Source: The Chronicles of Prydain (1964–1968), Book II: The Black Cauldron (1965), Chapter 14