Concerning Pain.
John of Damascus: Exposition of the Orthodox Faith. — translated by ANF/NPNF editors
Chapter XIV.—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.
Translated by ANF/NPNF editors. Edition ccel.npnf209.division.iii.en.