History of the Peloponnesian War

For when we had the envy of many and had reconquered some that had already revolted, and seeing you were no more our friends as you had been but suspected and quarrelled us, we held it no longer a safe course laying by our power to put ourselves into your danger. For the revolts from us would all have been made to you.

Now it is no fault for men in danger to order their affairs to the best.