M. Tullius Cicero, De Officiis
Walter Miller, Ed.

[16] 5. I have dwelt longer on this point than was necessary. For who is there to whom those facts which Panaetius narrates at great length are not self-evident—namely, that no one, either as a general in war or as a statesman at home, could have accomplished great things for the benefit of the state, without the hearty co-operation of other men? He cites the deeds of Themistocles, Pericles, Cyrus, Agesilaus, Alexander, who, he says, could not have achieved so great success without the support of other men. He calls in witnesses, whom he does not need, to prove a fact that no one questions.

And yet, as, on the one hand, we secure great¹ advantages through the sympathetic co-operation of our fellow-men; so, on the other, there is no curse so terrible but it is brought down by man upon man. There is a book by Dicaearchus on “The Destruction of Human Life.” He was a famous [p. 185] and eloquent Peripatetic, and he gathered together all the other causes of destruction—floods, epidemics, famines, and sudden incursions of wild animals in myriads, by whose assaults, he informs us, whole tribes of men have been wiped out. And then he proceeds to show by way of comparison how many more men have been destroyed by the assaults of men—that is, by wars or revolutions—than by any and all other sorts of calamity.