Flavius Josephus, The Wars of the Jews
William Whiston, A.M., Ed.

[39] And now Vespasian comforted his army, which was much dejected by reflecting on their ill success, and because they had never before fallen into such a calamity, and besides this, because they were greatly ashamed that they had left their general alone in great dangers. As to what concerned himself, he avoided to say any thing, that he might by no means seem to complain of it; but he said that "we ought to bear manfully what usually falls out in war, and this, by considering what the nature of war is, and how it can never be that we must conquer without bloodshed on our own side; for there stands about us that fortune which is of its own nature mutable; that while they had killed so many ten thousands of the Jews, they had now paid their small share of the reckoning to fate; and as it is the part of weak people to be too much puffed up with good success, so is it the part of cowards to be too much aftrighted at that which is ill; for the change from the one to the other is sudden on both sides; and he is the best warrior who is of a sober mind under misfortunes, that he may continue in that temper, and cheerfully recover what had been lost formerly; and as for what had now happened, it was neither owing to their own effeminacy, nor to the valor of the Jews, but the difficulty of the place was the occasion of their advantage, and of our disappointment. Upon reflecting on which matter one might blame your zeal as perfectly ungovernable; for when the enemy had retired to their highest fastnesses, you ought to have restrained yourselves, and not, by presenting yourselves at the top of the city, to be exposed to dangers; but upon your having obtained the lower parts of the city, you ought to have provoked those that had retired thither to a safe and settled battle; whereas, in rushing so hastily upon victory, you took no care of your safety. But this incautiousness in war, and this madness of zeal, is not a Roman maxim. While we perform all that we attempt by skill and good order, that procedure is the part of barbarians, and is what the Jews chiefly support themselves by. We ought therefore to return to our own virtue, and to be rather angry than any longer dejected at this unlucky misfortune, and let every one seek for his own consolation from his own hand; for by this means he will avenge those that have been destroyed, and punish those that have killed them. For myself, I will endeavor, as I have now done, to go first before you against your enemies in every engagement, and to be the last that retires from it."