The concept of good and evil did not begin with a single word, but with a cosmic war fought in the minds of ancient Iranians. The prophet Zoroaster, living around the 6th century BC, radically simplified the complex pantheon of early Iranian gods into two opposing forces: Ahura Mazda, the Illuminating Wisdom, and Angra Mainyu, the Destructive Spirit. This was not merely a theological adjustment; it was the birth of a dualistic worldview where the material world was often seen as a battleground between light and darkness. This idea evolved into a religion that spawned many sects, some of which embraced an extreme belief that the material world should be shunned entirely while the spiritual world was embraced. Gnostic ideas influenced many ancient religions, teaching that gnosis, or enlightenment, could be reached by practicing philanthropy to the point of personal poverty and sexual abstinence. In ancient Egypt, a similar dichotomy existed between Ma'at, the principle of justice, order, and cohesion, and Isfet, the principle of chaos, disorder, and decay. This correspondence was also reflected in ancient Mesopotamian religion, where the conflict between Marduk and Tiamat mirrored the eternal struggle between order and chaos. These ancient frameworks established the foundational language for morality, defining evil not just as a mistake, but as a force actively working against the stability of the universe.
The Birth of Absolutes
In the classical world, the basic meanings of the Greek words kakos and agathos were relative, meaning bad and cowardly versus good and brave, yet their absolute sense emerged only around 400 BC with pre-Socratic philosophy, particularly Democritus. Morality in this absolute sense solidified in the dialogues of Plato, who introduced the concept of the Form of the Good, an eternal realm of ideas that existed independently of human perception. This development was further advanced in Late Antiquity by Neoplatonists, Gnostics, and Church Fathers, who transformed ethics from a matter of regional custom into a universal truth. The terms ethics and morality themselves derive from words for regional custom, Greek ethos and Latin mores, highlighting the shift from local habits to absolute laws. Augustine of Hippo, writing in the 4th and 5th centuries, defined sin as a word, deed, or desire in opposition to the eternal law of God, a definition that would dominate Western thought for centuries. Medieval Christian theologians broadened and narrowed this concept until it possessed several complex definitions, ranging from personal preference to religious obligation leading to sainthood or damnation. This era marked the transition from viewing morality as a social contract to viewing it as a cosmic imperative, where the very nature of reality was tied to the distinction between the good and the evil.
Modern psychology has turned the mirror inward, suggesting that evil is not an external force but a projection of the human psyche. Carl Jung, in his book Answer to Job, depicted evil as the dark side of the Devil, arguing that people tend to believe evil is something external because they project their shadow onto others. Jung interpreted the story of Jesus as an account of God facing his own shadow, suggesting that the divine itself contains the capacity for evil. This internalization of evil was further explored by Philip Zimbardo, who in 2007 suggested that people may act in evil ways as a result of a collective identity. His hypothesis, based on his previous experience from the Stanford prison experiment, was published in the book The Lucifer Effect: Understanding How Good People Turn Evil. Zimbardo argued that situational forces and group dynamics could transform ordinary individuals into perpetrators of atrocities. Psychiatrist M. Scott Peck described evil as militant ignorance, a malignant type of self-righteousness that results in the projection of evil onto selected specific innocent victims. Peck noted that evil people are consistently self-deceiving, maintaining a high level of respectability while lying incessantly to avoid guilt. This psychological perspective challenges the traditional view of evil as a supernatural entity, instead framing it as a failure of consciousness and a refusal to acknowledge one's own capacity for harm.
The Theological Paradox
For the Abrahamic religions, explaining and finding a religious answer to the dichotomy of good and evil has never been an easy task, as scholars struggle to preserve both monotheism and God's attributes of omnipotence and omnibenevolence. In Christianity, the Catholic Church extracts its understanding of evil from its canonical antiquity, with the Dominican theologian Thomas Aquinas defining evil as the absence or privation of good. This view suggests that evil has no independent existence, much like darkness is merely the absence of light. The Bahá'í Faith asserts that evil is non-existent and is a concept for the lacking of good, just as cold is the state of no heat. In Islam, there is no concept of absolute evil as a fundamental universal principle independent from and equal with good; instead, things perceived as evil are either natural events or caused by humanity's free will to disobey God's orders. Judaism introduces the concept of yetzer hara, the congenital inclination to do evil, which is man's misuse of things the physical body needs to survive. The Talmudic tractate Avot de-Rabbi Natan states that a boy's evil inclination is greater than his good inclination until he turns 13, at which point the good inclination is born. These theological frameworks attempt to reconcile the existence of suffering and malice with the belief in a benevolent creator, often concluding that evil is a necessary byproduct of free will or a test of faith.
The Eastern Compass
In Eastern traditions, the binary opposition of good and evil is often replaced by a focus on balance, harmony, and the consequences of action. Buddhist ethics are traditionally based on what Buddhists view as the enlightened perspective of the Buddha, with the Indian term for ethics or morality being Śīla, a code of conduct that embraces a commitment to harmony and self-restraint with the principal motivation being nonviolence. Sīla is an internal, aware, and intentional ethical behavior, functioning as an ethical compass within self and relationships rather than an external constraint. In Hinduism, the concept of dharma or righteousness clearly divides the world into good and evil, explaining that wars have to be waged sometimes to establish and protect dharma, a war called Dharmayuddha. The Hindu holy text, the Bhagavad Gita, speaks of the balance of good and evil, noting that when this balance goes off, divine incarnations come to help restore it. Sikhism teaches that the idea of evil changes depending on one's position on the path to liberation; at the beginning stages, good and evil may seem neatly separated, but once one's spirit evolves, the idea of evil vanishes and the truth is revealed. These traditions emphasize that evil is often a result of attachment, greed, wrath, lust, or egotism, known as the Five Thieves, which cloud the mind and lead one astray from the prosecution of righteous action.
The Politics of Necessity
Throughout history, political thinkers have argued that occasional minor evil could have a positive effect, a concept known as necessary evil. Martin Luther argued that one must sometimes commit a sin out of hate and contempt for the Devil, so as not to give him the chance to make one scrupulous over mere nothings. Niccolò Machiavelli, a 16th-century Florentine writer, advised tyrants that it is far safer to be feared than loved, offering treachery, deceit, and eliminating political rivals as methods of stabilizing the prince's security and power. The international relations theories of realism and neorealism, sometimes called realpolitik, advise politicians to explicitly ban absolute moral and ethical considerations from international politics, focusing instead on self-interest and political survival. Anton LaVey, founder of the Church of Satan, was a materialist who claimed that evil is actually good, responding to the common practice of describing sexuality or disbelief as evil. He argued that when the word evil is used to describe the natural pleasures and instincts of men and women, or the skepticism of an inquiring mind, the things called evil are really good. These perspectives challenge the notion that morality must be absolute, suggesting instead that in the realm of power and survival, the distinction between good and evil is often a matter of perspective and necessity.
The Ecology of Value
Modern ethical thought has expanded the definition of good beyond human relationships to include the flourishing of all sentient life and the health of the ecosystem. Many views value unity as a good, arguing that an individual person's flourishing is valuable only as a means to the flourishing of society as a whole. The naturalistic view suggests that what is of intrinsic good is the flourishing of all sentient life, extending to those animals that have some level of similar sentience, such as Great Ape personhood. Some go farther, declaring that life itself is of intrinsic value, and that remaining on Earth as a living being surrounded by a working ecosystem is the most basic value. Radical values environmentalism can be seen as a very old or very new view, where the only intrinsically good thing is a flourishing ecosystem, and individuals and societies are merely instrumentally valuable. Anthropological linguistics studies link between languages and the ecosystems they lived in, which gave rise to knowledge distinctions where offenses to nature were like those to other people. This perspective, reflected in Gaia philosophy and deep ecology, argues that without assuming ecosystem continuation as a universal good, it is impossible to justify operational requirements such as sustainability of human activity on Earth. The value of the Earth is now recognized as central in determining value, shifting the focus from human-centric morality to a planetary ethic.
The Future of Morality
The question of whether there is a universal, transcendent definition of evil or whether evil is determined by one's social or cultural background remains a fundamental philosophical debate. Moral absolutism holds that good and evil are fixed concepts established by a deity or nature, while moral relativism holds that standards of good and evil are only products of local culture, custom, or prejudice. Moral universalism attempts to find a compromise, claiming that morality is only flexible to a degree, and that what is truly good or evil can be determined by examining what is commonly considered to be evil amongst all humans. Plato wrote that there are relatively few ways to do good, but there are countless ways to do evil, which can therefore have a much greater impact on our lives. In the modern era, the concept of evil has been applied to institutions and technologies, with some arguing that the capacity to determine good and trade off fundamental values is expressed not by humans but by software, genetic engineering of humans, and artificial intelligence. Skeptics assert that rather than perfect goodness, it would only be the appearance of perfect goodness, reinforced by persuasion technology and brute force of violent technological escalation. The future of morality may depend on how humanity navigates the tension between the desire for absolute truths and the reality of a complex, changing world, where the definition of good and evil continues to evolve alongside our understanding of the universe.