History of the Peloponnesian War

Inexperience now makes you afraid of barbarians; and yet the trial of strength which you had with the Macedonians among them, and my own judgment, confirmed by what I hear from others, should be enough to satisfy you that they will not prove formidable.

Where an enemy seems strong but is really weak, a true knowledge of the facts makes his adversary the bolder, just as a serious antagonist is encountered most confidently by those who do not know him. Thus the present enemy might terrify an inexperienced imagination, they are formidable in outward bulk, their loud yelling is unbearable, and the brandishing of their weapons in the air has a threatening appearance.