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

[9] And now the banks were finished, they afforded a foundation for fear both to the Romans and to the Jews; for the Jews expected that the city would be taken, unless they could burn those banks, as did the Romans expect that, if these were once burnt down, they should never be able to take it; for there was a mighty scarcity of materials, and the bodies of the soldiers began to fail with such hard labors, as did their souls faint with so many instances of ill success; nay, the very calamities themselves that were in the city proved a greater discouragement to the Romans than those within the city; for they found the fighting men of the Jews to be not at all mollified among such their sore afflictions, while they had themselves perpetually less and less hopes of success, and their banks were forced to yield to the stratagems of the enemy, their engines to the firmness of their wall, and their closest fights to the boldness of their attack; and, what was their greatest discouragement of all, they found the Jews' courageous souls to be superior to the multitude of the miseries they were under, by their sedition, their famine, and the war itself; insomuch that they were ready to imagine that the violence of their attacks was invincible, and that the alacrity they showed would not be discouraged by their calamities; for what would not those be able to bear if they should be fortunate, who turned their very misfortunes to the improvement of their valor! These considerations made the Romans to keep a stronger guard about their banks than they formerly had done.