“The idea of evil as it appears in modern secular thought is an inheritance from Christianity. To be sure, rationalists have repudiated the idea; but it is not long before they find they cannot do without it. What has been understood as evil in the past, they insist, is error – a product of ignorance that human beings can overcome. Here they are repeating a Zoroastrian theme, which was absorbed into later versions of monotheism: the belief that ‘as the “lord of creation” man is at the forefront of the contest between the powers of Truth and Untruth.’ But how to account for the fact that humankind is deaf to the voice of reason? At this point rationalists invoke sinister interests – wicked priests, profiteers from superstition, malignant enemies of enlightenment, secular incarnations of the forces of evil. As so often is the case, secular thinking follows a pattern dictated by religion while suppressing religion’s most valuable insights. Modern rationalists reject the idea of evil while being obsessed by it. Seeing themselves as embattled warriors in a struggle against darkness, it has not occurred to them to ask why humankind is so fond of the dark. They are left with the same problem of evil that faces religion. The difference is that religious believers know they face an insoluble difficulty, while secular believers do not. Aware of the evil in themselves, traditional believers know it cannot be expelled from the world by human action. Lacking this saving insight, secular believers dream of creating a higher species. They have not noticed the fatal flaw in their schemes: any such species will be created by actually existing human beings.”

The Faith of Puppets: The Revelation of Philip K. Dick (p. 60)
The Soul of the Marionette: A Short Enquiry into Human Freedom (2015)

Massachusetts must lead in teaching it.
1920s, Law and Order (1920)

Matterhorn: A Novel of the Vietnam War, Ch. 19 (2010).
Context: He thought of the jungle, already regrowing around him to cover the scars they had created. He thought of the tiger, killing to eat. Was that evil? And ants? They killed. No, the jungle wasn't evil. It was indifferent. So, too, was the world. Evil, then, must be the negation of something man had added to the world. Ultimately, it was caring about something that made the world liable to evil. Caring. And then the caring gets torn asunder. Everybody dies, but not everybody cares.It occurred to Mellas that he could create the possibility of good or evil through caring. He could nullify the indifferent world. But in so doing he opened himself up to the pain of watching it get blown away. His killing that day would not have been evil if the dead soldiers hadn't been loved by mothers, sisters, friends, wives. Mellas understood that in destroying the fabric that linked those people, he had participated in evil, but this evil had hurt him as well. He also understood that his participation in evil, was a result of being human. Being human was the best he could do. Without man there would be no evil. But there was also no good, nothing moral built over the world of fact. Humans were responsible for it all. He laughed at the cosmic joke, but he felt heartsick.

Freedom for Über-Marionettes: What Science Won't Tell You (p. 151)
The Soul of the Marionette: A Short Enquiry into Human Freedom (2015)

Source: Autobiography (1873)

https://archive.org/details/autobiography01mill/page/42/mode/1up p. 42

Source: Memoirs (1885), Chapter I, p. 78

The Law of Mind (1892)

"The Genealogy of Animals", p. 85
The Universal Kinship (1906), The Physical Kinship