/summa/SS/SSIII/SS_Q155:
We must next consider the potential parts of temperance: (1) continence; (2) clemency; (3) modesty. Under the first head we must consider continence and incontinence. With regard to continence there are four points of inquiry:
(1) Whether continence is a virtue?
(2) What is its matter?
(3) What is its subject?
(4) Of its comparison with temperance.