27 Peace worthy of the name must be founded on the principles of charity and justice which He taught who is the "Prince of Peace," and who adopted this title as a kind of royal standard for Himself. True peace is that which the Church desires to be established: one that is stable, just, fair, and founded on right order; one which binds all together - citizens, families, and peoples - by the firm ties of the rights of the Supreme Lawgiver, and by the bonds of mutual fraternal love and cooperation.
Source: Ad Apostolorum Principis (Vatican.va)