History of the Peloponnesian War

For they are coming against us with a belief that we shall offer no resistance; with good reason contemning us, because we did not join the Lacedaemonians in destroying them. But if they saw us acting with courage beyond their expectation, they would be more dismayed at that unlooked-for result, than at the power which we really possess.

Be persuaded, therefore to show this boldness, if possible; but if not, then, as quickly as possible, to get ready all other resources for the war; and to think, every one of you, that contempt for your assailants is best shown by bravery of deeds; but that, for the present, to consider those preparations most safe which are made with a feeling of fear, and to act as in a season of danger, would prove most to your advantage. For those men are both coming against us, and already, I know for certain, on their voyage, and all but here.