You need to tell this to Noam Chomsky, too, then, because that's from whom I got it. To wit:
"Concepts aside, actions in the real world all too often reinforce the maxim of Thucydides that 'The strong do as they can, while the weak suffer what they must' — which is not only indisputably unjust, but at the present stage of human civilisation, a literal threat to the survival of the species."
--Noam Chomsky, http://www.chomsky.info/articles/20060509.htm
And:
"Chomsky: The answer was given a long time ago by Thucydides (the Melian dialogue, in The Peloponnesian War, Book 5): The strong do as they can, and the weak suffer as they must."
http://www.chomsky.info/interviews/20060821.htm
There is a Shakespeare quote that is very similar, but it's dialog from one of Shakespeare's characters. "Timon of Athens," I think. That's also a rotating quote at the blog.
-B.
Carrol Cox wrote:
"On your blog you have a sidebar quoting 'Thucydides' as saying, 'The strong do what they can while the weak suffer what they must.' This is like quoting _Shakespeare_ (as opposed to that old windbag Polonius) as saying to thine own self etc. It's been awhile since I read Thucydides but he didn't say this, he quoted someone else (I think some Athenian diplomats) as saying it."