Caius Marius

This was his language in private to his officers and equals; but he would station his soldiers on the fortifications by detachments, bidding them to observe the enemy, and in this way accustomed them not to fear their shape or dread their cries, which were altogether strange and ferocious; and to make themselves acquainted with their equipment and movements, thus in course of time rendering what was only apparently formidable familiar to their minds from observation. For he considered that their novelty falsely imparts to terrifying objects many qualities which they do not possess, but that with familiarity even those things which are really dreadful lose their power to affright.

And so in the case of his soldiers, not only did the daily sight of the enemy lessen somewhat their amazement at them, but also, when they heard the threats and the intolerable boasting of the Barbarians, their anger rose and warmed and set on fire their spirits; for the enemy were ravaging and plundering all the country round, and besides, often attacked the Roman fortifications with great temerity and shamelessness, so that indignant speeches of his soldiers reached the ears of Marius.