Laudator Temporis Acti

Tacitus, Histories 3.81.1 (tr. Clifford H. Moore):

Musonius Rufus had joined these delegates. He was a member of the equestrian order, a man devoted to the study of philosophy and in particular to the Stoic doctrine. Making his way among the companies, he began to warn those in arms, discoursing on the blessings of peace and the dangers of war. Many were moved to ridicule by his words, more were bored; and there were some ready to jostle him about and to trample on him, if he had not listened to the warnings of the quieter soldiers and the threats of others and given up his untimely moralizing.

miscuerat se legatis Musonius Rufus equestris ordinis, studium philosophiae et placita Stoicorum aemulatus; coeptabatque permixtus manipulis, bona pacis ac belli discrimina disserens, armatos monere. id plerisque ludibrio, pluribus taedio: nec deerant qui propellerent proculcarentque, ni admonitu modestissimi cuiusque et aliis minitantibus omisisset intempestivam sapientiam.

Cf. Matthew 5:9 (KJV):

Blessed are the peacemakers...

μακάριοι οἱ εἰρηνοποιοί...