What is signified by this promise?

The sublimity both of their work and of their reward: for in what they do, they imitate the Only-Begotten Son of God, who came to earth to reconcile fallen man with God (2Co 5:18–19). Therefore, they are promised the gracious name of sons of God and a corresponding degree of blessedness.

Christ himself “is our peace” (Eph 2:14), and his bequest to his disciples is peace: “Peace I leave with you! My peace I give to you! I do not give to you as the world gives” (Joh 14:27; see Q390, Q607). Peacemaking therefore begins within: as St Seraphim of Sarov teaches, “acquire the spirit of peace, and thousands around you will be saved” (St Seraphim of Sarov).