Mbh 12.125.1

"'Yudhishthira said, "Thou hast said, O grandsire, that behaviour is the first (of requisites for a man). Whence, however, does Hope arise? Tell me what it is. This great doubt has taken possession of my mind. There is no other person than thee, O subjugator of hostile towns, who can remove it. O grandsire, I had great hope in respect of Suyodhana that when a battle was about to ensue (in consequence of his own obstinacy), he would, O lord, do what was proper. In every man hope is great. When that hope is destroyed, great is the grief that succeeds, and which, without doubt, is equal to almost death itself. Fool that I am, Dhritarashtra's wicked-souled son, Duryodhana, destroyed the hope I had cherished. Behold, O king, the foolishness of my mind! I think that hope is vaster than a mountain with all its trees. Or, perhaps, it is vaster than the firmament itself. Or, perhaps, O king, it is really immeasurable. Hope, O chief of the Kurus, is exceedingly difficult of being understood and equally difficult of being subdued. Beholding this last attribute of Hope, I ask, what else is so unconquerable as this?"