Quare ego illum ipsum furorem motumque castrensem reor exstitisse, quia magna vi magnoque terrore modestia tua vincenda erat; ac sicut maris caelique temperiem turbines tempestatesque commendant, ita ad augendam pacis tuae gratiam illum tumultum praecessisse crediderim.
This, I fancy, explains the rioting and mutiny which had broken out in the army; it was to provide the widespread violence and terror which were needed to overcome your diffidence. Just as a period of calm in sky and sea is welcomed by contrast with storm and tempest, similarly, I think, that earlier season of unrest was designed to increase our appreciation of the peace we owe to you.
final_alignments\Pliny_Younger_Panegyricus.json