Nicene and Post-Nicene Fathers, Ser. II, Vol. IX: John of Damascus: Exposition of the Orthodox Faith.: Concerning Pain.
There are four varieties of pain, viz., anguish 1823 , grief 1824 , envy, pity. Anguish is pain without utterance: grief is pain that is heavy to bear like a burden: envy is pain over the good fortune of others: pity is pain over the evil fortune of others.