The grace (η χαρις). Paul prefers this noble word to the customary ερρωσθε (Farewell, Be strong). See 2. Thessalonians 3:18 for identical close save added παντων (all). A bit shorter form in 1. Corinthians 16:23; Romans 16:20 and still shorter in Colossians 4:18; 1. Timothy 6:21; Titus 3:15; 2. Timothy 4:22. The full Trinitarian benediction we find in 2. Corinthians 13:13.