Whether peace is a virtue?

Objections

Objection 1 : It would seem that peace is a virtue. For nothing is a matter of precept, unless it be an act of virtue. But there are precepts about keeping peace, for example: "Have peace among you" (Mk. 9:49). Therefore peace is a virtue.
Objection 2 : Further, we do not merit except by acts of virtue. Now it is meritorious to keep peace, according to Mt. 5:9: "Blessed are the peacemakers, for they shall be called the children of God." Therefore peace is a virtue.
Objection 3 : Further, vices are opposed to virtues. But dissensions, which are contrary to peace, are numbered among the vices (Gal. 5:20). Therefore peace is a virtue.