Cruelty can be described as deriving pleasure from deliberately inflicting suffering on others. Psychologically, cruelty is the manifestation of frustration and anger, which is given vent by deliberate aggression. Cruelty is a general human phenomenon, as animals do not really inflict pain on mere whim. It is only humans who can truly comprehend pain and suffering and voluntarily inflict it on others to satiate their sadistic instinct or avenge an insult. To get a better understanding on cruelty, read the cruelty quotes given below.