Mbh 12.52.3

"'Vasudeva said, "The words spoken by thee are worthy of thee that art the foremost one of Kuru's race, thee that art endued with great energy, thee that art of great soul, and thee that art possessed of great patience and conversant with every subject. Regarding what thou hast said unto me about the pain of thy arrow-wounds, receive, O Bhishma, this boon that I grant thee, O puissant one, from my grace. Discomfort and stupefaction and burning and pain and hunger and thirst shall not, O son of Ganga, overcome thee, O thou of unfading glory! Thy perceptions and memory, O sinless one, shall be unclouded.[158] Thy understanding shall not fail thee. Thy mind, O Bhishma, freed from the qualities of passion and darkness, will always be subject to the quality of goodness, like the moon emerged from the clouds. Thy understanding will penetrate whatever subject connected with duty, morality, or profit, thou wilt think upon. O tiger among kings, obtaining celestial vision, thou wilt, O thou of immeasurable prowess, succeed in beholding the four orders of created things. Endued with the eye of knowledge, thou wilt, O Bhishma, behold, like fishes in a limpid stream, all created things that thou mayst endeavour to recollect!"'