History of the Peloponnesian War

Not that confidence is out of place in an army of invasion, but in an enemy's country it should also be accompanied by the precautions of apprehension: troops will by this combination be best inspired for dealing a blow, and best secured against receiving one.

In the present instance, the city against which we are going, far from being so impotent for defence, is on the contrary most excellently equipped at all points; so that we have every reason to expect that they will take the field against us, and that if they have not set out already before we are there, they will certainly do so when they see us in their territory wasting and destroying their property.

For men are always exasperated at suffering injuries to which they are not accustomed, and on seeing them inflicted before their very eyes; and where least inclined for reflection, rush with the greatest heat to action.

The Athenians are the very people of all others to do this, as they aspire to rule the rest of the world, and are more in the habit of invading and ravaging their neighbors' territory, than of seeing their own treated in the like fashion.

Considering, therefore, the power of the state against which we are marching, and the greatness of the reputation which, according to the event, we shall win or lose for our ancestors and ourselves, remember as you follow where you may be led to regard discipline and vigilance as of the first importance, and to obey with alacrity the orders transmitted to you; as nothing contributes so much to the credit and safety of an army as the union of large bodies by a single discipline.’