Tradition
St. John of Damascus
Exposition of the Faith
Book 2 › Chapter 14
Concerning Pain
There are four varieties of pain, viz., anguish, grief, 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.
Source: Exposition of the Faith (New Advent)