Self-control, n.
Control of one's self; restraint exercised over one's self; self-command.
Shades of meaning
Fernald has no entry of its own for self-control; he lists it under abstinence, self-abnegation.
Where he writes about it:
Self-control is holding oneself within due limits in pleasures and duties, as in all things else; self-denial, the giving up of pleasures for the sake of duty. — from self-abnegation