As for him who envies or even fears us (and envied and feared great powers must always be), and who on this account wishes Syracuse to be humbled to … - Thucydides

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As for him who envies or even fears us (and envied and feared great powers must always be), and who on this account wishes Syracuse to be humbled to teach us a lesson, but would still have her survive in the interest of his own security, the wish that he indulges is not humanly possible. A man can control his own desires but he cannot likewise control circumstances; and in the event of his calculations proving mistaken, he may live to bewail his own misfortune, and wish to be again envying my prosperity. An idle wish, if he now sacrifice us and refuse to take his share of perils which are the same in reality, though not in name, for him as for us; what is nominally the preservation of our power being really his own salvation.