Compassion is the emotion that one feels in response to the suffering of others that motivates a desire to help.Compassion is often regarded as having an emotional aspect to it, though when based on cerebral notions such as fairness, justice and interdependence, it may be considered rational in nature and its application understood as an activity based on sound judgment. There is also an aspect of compassion which regards a quantitative dimension, such that individual's compassion is often given a property of "depth," "vigour," or "passion." The etymology of "compassion" is Latin, meaning "co-suffering." More involved than simple empathy, compassion commonly gives rise to an active desire to alleviate another's suffering.Compassion is often, though not inevitably, the key component in what manifests in the social context as altruism.[citation needed] In ethical terms, the expressions down the ages of the so-called Golden Rule often embodies by implication the principle of compassion: Do to others what you would have them do to you.[original research?]The English noun compassion, meaning to love together with, comes from Latin. Its prefix com- comes directly from com, an archaic version of the Latin preposition and affix cum (= with); the -passion segment is derived from passus, past participle of the deponent verb patior, patī, passus sum. Compassion is thus related in origin, form and meaning to the English noun patient (= one who suffers), from patiens, present participle of the same patior, and is akin to the Greek verb πάσχειν (= paskhein, to suffer) and to its cognate noun πάθος (= pathos). Ranked a great virtue in numerous philosophies, compassion is considered in almost all the major religious traditions as among the greatest of virtues.