Evil, by one definition, is being bad and acting out morally incorrect behavior; or it is the condition of causing unnecessary pain and suffering, thus containing a net negative on the world.
Sendan Kendatsuba, one of the eight guardians of Buddhist law, banishing evil in one of the five paintings of Extermination of Evil
The devil, in opposition to the will of God, represents evil and tempts Christ, the personification of the character and will of God. Ary Scheffer, 1854.
Extermination of Evil, The God of Heavenly Punishment, from the Chinese tradition of yin and yang. Late Heian period (12th-century Japan).
Martin Luther believed that occasional minor evil could have a positive effect.
Suffering, agony, or pain in a broad sense, may be an experience of unpleasantness or aversion, possibly associated with the perception of harm or threat of harm in an individual. Suffering is the basic element that makes up the negative valence of affective phenomena. The opposite of suffering is pleasure or happiness.
Tragic mask on the façade of the Royal Dramatic Theatre in Stockholm, Sweden
Mahavira torch-bearer of ahimsa
Landscape with the Fall of Icarus by Pieter Bruegel the Elder
Neuroimaging sheds light on the seat of suffering