You know and we know, as practical men that the question of justice arises only between parties equal in strength and that the strong do what they ca… - Thucydides

Right, as the world goes, is only in question between equals in power, while the strong do what they can and the weak suffer what they must.

Let him remember that many before now have tried to chastise a wrongdoer, and failing to punish their enemy have not even saved themselves; while many who have trusted in force to gain an advantage, instead of gaining anything more, have been doomed to lose what they had. Vengeance is not necessarily successful because wrong has been done, or strength sure because it is confident; but the incalculable element in the future exercises the widest influence, and is the most treacherous, and yet in fact the most useful of all things, as it frightens us all equally, and thus makes us consider before attacking each other.

We regard wealth as something to be properly used, rather than as something to boast about. As for poverty, no one need to be ashamed to admit it: the real shame is in not taking practical measures to escape from it. -p147 History of Peloponnesian War

(Corinthians:) The spirit of trust, Lacedaemonians, which animates your own political and social life, makes you distrust others who, like ourselves, have something unpleasant to say, and this temper of mind, though favourable to moderation, too often leaves you in ignorance of what is going on outside your own country, but instead of taking our words to heart, you chose to suspect that we only spoke from interested motives.