Evil in the context of "Good"

Middle Platonism is the modern name given to a revival and outgrowth of Platonic philosophy, lasting from about 90 BC – when Antiochus of Ascalon rejected the scepticism of the new Academy – until the development of neoplatonism under Plotinus in the 3rd century. Middle Platonism absorbed many doctrines from the rival Peripatetic and Stoic schools. The pre-eminent philosopher in this period, Plutarch (c. 45–120), defended the freedom of the will and the immortality of the soul. He sought to show that God, in creating the world, had transformed matter, as the receptacle of evil, into the divine soul of the world, where it continued to operate as the source of all evil. God is a transcendent being, who operates through divine intermediaries, which are the gods and daemons of popular religion. Numenius of Apamea (c. 160) combined Platonism with neopythagoreanism and other eastern philosophies, in a move which would prefigure the development of neoplatonism.

In European folklore of the medieval and early modern periods, familiars (strictly familiar spirits, as "familiar" also meant just "close friend" or companion, and may be seen in the scientific name for dog, Canis familiaris) were believed to be supernatural entities, interdimensional beings, or spiritual guardians that would protect or assist witches and cunning folk in their practice of magic, divination, and spiritual insight. According to records of the time, those alleging to have had contact with familiar spirits reported that they could manifest as numerous forms, usually as an animal, but sometimes as a human or humanoid figure, and were described as "clearly defined, three-dimensional... forms, vivid with colour and animated with movement and sound", as opposed to descriptions of ghosts with their "smoky, undefined form[s]".

When they served witches, they were often thought to be malevolent, but when working for cunning folk, they were often considered benevolent (although there was some ambiguity in both cases). The former were often categorized as demons, while the latter were more commonly thought of and described as fairies. The main purpose of familiars was to serve the witch, providing protection for them as they came into their new powers.

The mythology or religion of most cultures incorporate a god of death or, more frequently, a divine being closely associated with death, an afterlife, or an underworld. They are often amongst the most powerful and important entities in a given tradition, reflecting the fact that death, like birth, is central to the human experience. In religions where a single god is the primary object of worship, the representation of death is usually that god's antagonist, and the struggle between the two is central to the folklore of the culture. In such dualistic models, the primary deity usually represents good, and the death god embodies evil. Similarly, death worship is used as a derogatory term to accuse certain groups of morally abhorrent practices which set no value on human life. In monotheistic religions, death is commonly personified by an angel or demon standing in opposition to the god.

In philosophy, religion, and psychology, "good and evil" is a common dichotomy. In religions with Manichaean and Abrahamic influence, evil is perceived as the dualistic antagonistic opposite of good, in which good should prevail and evil should be defeated.

Evil is often used to denote profound immorality. Evil has also been described as a supernatural force. Definitions of evil vary, as does the analysis of its motives. However, elements that are commonly associated with evil involve unbalanced behavior involving expediency, selfishness, ignorance, or negligence.

In Abrahamic religions, the Messianic Age (Hebrew: יְמוֹת הַמָשִׁיחַ) is the future eternal period of time on Earth in which the messiah will reign and bring universal peace and brotherhood, without any evil (through mankind's own terms). Some refer to it as the consummate "kingdom of God" or the "world to come". Jews believe that such a figure is yet to come, while Christians believe that this figure is Jesus Christ.

In religion, a false prophet or pseudoprophet is a person who falsely claims the gift of prophecy or divine inspiration, or to speak for God, or who makes such claims for evil ends. Often, someone who is considered a "true prophet" by some people is simultaneously considered a "false prophet" by others, even within the same religion as the "prophet" in question. In a wider sense, it is anyone who, without having it, claims a special connection to the deity and sets themself up as a source of spirituality, as an authority, preacher, or teacher. Analogously, the term is sometimes applied outside religion to describe someone who fervently promotes a theory that the speaker thinks is false.

A villain (masculine), or villainess (feminine), also bad guy, baddy or baddie (sometimes known as a "black hat"), is a stock character, whether based on a historical narrative or one of literary fiction. Random House Unabridged Dictionary defines such a character as "a cruelly malicious person who is involved in or devoted to wickedness or crime; scoundrel; or a character in a play, novel, or the like, who constitutes an important evil agency in the plot". The antonym of a villain is a hero.

The villain's structural purpose is to serve as the opposite to the hero character, and their motives or evil actions drive a plot along. In contrast to the hero, who is defined by feats of ingenuity and bravery and the pursuit of justice and the greater good, a villain is often defined by their acts of selfishness, evilness, arrogance, cruelty, and cunning, displaying immoral behavior that can oppose or pervert justice.

Harm is a moral and legal concept with multiple definitions. It generally functions as a synonym for evil or anything that is bad under certain moral systems. Something that causes harm is harmful, and something that does not is harmless.