(n.) Restraint over one's self; self-control; self-command.

abnegation abstinence aplomb assurance balance calm calmness composure confidence conservatism constraint continence control cool denial discipline dispassion equability equanimity equilibrium evenness forbearance frugality gentleness golden mean happy medium impartiality independence judiciousness juste-milieu lenity level head levelheadedness meden agan middle way mildness moderateness moderation moderationism neutrality nonviolence nothing in excess pacifism poise possession presence of mind prudence renouncement renunciation repose restraint self-abnegation self-assurance self-command self-confidence self-conquest self-control self-denial self-discipline self-government self-mastery self-possession serenity soberness sobriety sophrosyne stability steadiness temperance temperateness tranquillity unexcessiveness unextravagance unextremeness via media well-regulated mind willpower