Evil is only imperfection, that which is not complete, which is becoming, but has not yet found its end.

Evil is nothing but a word, an objectification where no objectification is necessary. Cast aside this notion of some external agency as the source of inconceivable inhumanity - the sad truth is our possession of an innate proclivity towards indifference, towards deliberate denial of mercy, towards disengaging all that is moral within us.
But if that is too dire , let's call it evil. And paint it with fire and venom.

“Evil” is first and foremost a religious notion. It means whatever a religion dislikes.

Evil is a by-product of forgetfulness, laziness, or distraction: it arises when we lose sight of our true aim in life

I told you once that I was searching for the nature of evil. I think I’ve come close to defining it: a lack of empathy. It’s the one characteristic that connects all the defendants. A genuine incapacity to feel with their fellow man. Evil, I think, is the absence of empathy.

If there is such a phenomenon as absolute evil, it consists in treating another human being as a thing.

The so-called evils are evils only in relation to a certain thing, and that which is evil in relation to a certain existing thing, either includes the non-existence of that thing or the non-existence of some of its good conditions.

Evil is the absence of God.

Evil is license, and that is why it is monotonous: everything has to be drawn from ourselves. One is condemned to false infinity. That is hell itself.

Evil…doesn’t mean doing things that have bad consequences for people. It means private thoughts and actions that are not to “the Christian majority’s” private liking.

Evil is movement towards void.

Evil," the priest said, after he had settled comfortably into Barrent's best chair, "is that force within us which inspires men to acts of strength and endurance. The worship of Evil is essentially the worship of oneself, and therefore the only true worship. The self which one worships is the ideal social being; the man content in his niche in society, yet ready to grasp any opportunity for advancement; the man who meets death with dignity, who kills without the demeaning vice of pity. Evil is cruel, since it is a true reflection of the uncaring and insensate universe. Evil is eternal and unchanging, although it comes to us in the many forms of protean life.

In most African cultures, evil is conceived of as the consequence of a transgression of what is prescribed, whether divine precepts - which unconditionally call for obedience and submission - or a social law dictated by the authorities that govern as well as ritualistic interdicts or prescriptions. Any action that diminishes or destroys life and any act or attitude and behavior that breaks the unity, the order or the harmony of things are also considered as evils.

"When I say that evil has to do with killing, I do not mean to restrict myself to corporeal murder. Evil is that which kills spirit. There are various essential attributes of life — particularly human life — such as sentience, mobility, awareness, growth, autonomy, will. It is possible to kill or attempt to kill one of these attributes without actually destroying the body. Thus we may "break" a horse or even a child without harming a hair on its head.

Erich Fromm was acutely sensitive to this fact when he broadened the definition of necrophilia to include the desire of certain people to control others-to make them controllable, to foster their dependency, to discourage their capacity to think for themselves, to diminish their unpredectibility and originalty, to keep them in line. Distinguishing it from a "biophilic" person, one who appreciates and fosters the variety of life forms and the uniqueness of the individual, he demonstrated a "necrophilic character type," whose aim it is to avoid the inconvenience of life by transforming others into obedient automatons, robbing them of their humanity.

Evil then, for the moment, is the force, residing either inside or outside of human beings, that seeks to kill life or liveliness. And goodness is its opposite. Goodness is that which promotes life and liveliness."