/summa/FS/FSIII/FS_Q32:
We must now consider the causes of pleasure: and under this head there are eight points of inquiry:
(1) Whether operation is the proper cause of pleasure?
(2) Whether movement is a cause of pleasure?
(3) Whether hope and memory cause pleasure?
(4) Whether sadness causes pleasure?
(5) Whether the actions of others are a cause of pleasure to us?
(6) Whether doing good to another is a cause of pleasure?
(7) Whether likeness is a cause of pleasure?
(8) Whether wonder is a cause of pleasure?