History of the Peloponnesian War

and after we had once incurred the hatred of most of our allies, and several of them had already revolted and been reduced to subjection, and when you were no longer friendly as before but suspicious and at variance with us, it no longer seemed safe to risk relaxing our hold. For all seceders would have gone over to you.

And no man is to be blamed for making the most of his advantages when it is a question of the gravest dangers.