Euripides, Iphigenia at Aulis 334–377: First episode: Menelaus reproaches Agamemnon for his changes of mind

Yes, but a mind unstable is an unjust possession, disloyal to friends. Now I am anxious to test you, and do not seek from rage to turn aside from the truth, nor will I on my part overstrain the case. Do you remember when you were all eagerness to captain the Danaids against Troy, making a pretence of declining, though eager for it in your heart; how humble you were then, taking each man by the hand and keeping open doors for every fellow-townsman who cared to enter, affording each in turn chance to speak with you, even though some did not wish it, seeking by these methods to purchase popularity from all bidders? Then when you had secured the command, there came a change over your manners; you were no longer so cordial as before to former friends, but hard of access, seldom to be found at home. But the man of real worth ought not to change his manners in the hour of prosperity, but should then show himself most staunch to friends, when his own good fortune can help them most effectually.

This was the first cause I had to reprove you, for it was here I first discovered your villainy; but afterwards, when you came to Aulis with all the gathered hosts of Hellas, you were of no account; no! the want of a favorable breeze filled you with consternation at the chance dealt out by the gods. Then the Danaids began demanding that you should send the fleet away instead of vainly toiling on at Aulis; what dismay and confusion was then depicted in your looks, to think that you, with a thousand ships at your command, had not occupied the plains of Priam with your armies! And you would ask my counsel, What am I to do? What scheme can I devise, where find one?—to save yourself being stripped of your command and losing your fair fame. Next when Calchas bade you offer your daughter in sacrifice to Artemis, declaring that the Danaids should then sail, you were overjoyed, and gladly undertook to offer the girl, and of your own accord—never allege compulsion—you are sending word to your wife to despatch your daughter here on pretence of wedding Achilles. And after all you turn round and have been caught casting your letter to this effect: I will no longer be my daughter’s murderer. Exactly so! This is the same air that heard you say it. Countless others have done the same; they make an effort while in power, and then retire dishonorably, sometimes owing to the senselessness of the citizens, sometimes deservedly, because they are too feeble of themselves to maintain their watch upon the state. For my part, I am more sorry for our unhappy Hellas, whose purpose was to read these worthless foreigners a lesson, while now she will let them escape and mock her, thanks to you and your daughter. May I never appoint a man to rule my country or lead its warriors because of his courage! Sense is what the general must have; since any man, with ordinary intelligence, can govern a state.

For brothers to come to words and blows, whenever they disagree, is terrible.