Morality is a set of rules that enable people to live together in harmony,
and virtue involves internalizing those rules. Insofar as virtue depends on
overcoming selfish or antisocial impulses for the sake of what is best for
the group or collective, self-control can be said to be the master virtue.
We analyze vice, sin, and Virtue from the perspective of self-control theo
ry. Recent research findings indicate that self-control involves expenditur
e of some limited resource and suggest the analogy of a moral muscle as an
appropriate way to conceptualize virtue in personality. Guilt fosters virtu
ous self-control by elevating interpersonal obligations over personal, self
ish interests. Several features of modern Western society make virtue and s
elf-control especially difficult to achieve.