/summa/FS/FSV/FS_Q64:
We must now consider the properties of virtues: and (1) the mean of virtue, (2) the connection between virtues, (3) equality of virtues, (4) the duration of virtues. Under the first head there are four points of inquiry:
(1) Whether moral virtue observes the mean?
(2) Whether the mean of moral virtue is the real mean or the rational mean?
(3) Whether the intellectual virtues observe the mean?
(4) Whether the theological virtues do?