History of the Peloponnesian War

You must fortify Decelea in Attica, the blow of which the Athenians are always most afraid and the only one that they think they have not experienced in the present war; the surest method of harming an enemy being to find out what he most fears, and to choose this means of attacking him, since every one naturally knows best his own weak points and fears accordingly.

The fortification in question, while it benefits you, will create difficulties for your adversaries, of which I shall pass over many, and shall only mention the chief. Whatever property there is in the country will most of it become yours, either by capture or surrender; and the Athenians will at once be deprived of their revenues from the silver mines at Laurium, of their present gains from their land and from the law courts, and above all of the revenue from their allies, which will be paid less regularly, as they lose their awe of Athens, and see you addressing yourselves with vigour to the war.

The zeal and speed with which all this shall be done depends, Lacedaemonians, upon yourselves; as to its possibility, I am quite confident, and I have little fear of being mistaken.

Meanwhile I hope that none of you will think any the worse of me if after having hitherto passed as a lover of my country, I now actively join its worst enemies in attacking it, or will suspect what I say as the fruit of an outlaw's enthusiasm.

I am an outlaw from the iniquity of those who drove me forth, not, if you will be guided by me, from your service: my worst enemies are not you who only harmed your foes, but they who forced their friends to become enemies;