"'"The king said, 'O best of regenerate persons, I am ready to grant thee a hundred of boons, what dost thou say then of one only? From the affection I bear thee and the reverence in which I hold thee, there is nothing that I cannot give thee.' "'"The priest said, 'I desire to have only one boon, O king, thou hast been pleased with me. Swear that thou wouldst tell me the truth instead of any untruth.'" "'Bhishma continued, "Thus addressed by the priest, O Yudhishthira, the king said unto him--'So be it. If what thou wouldst ask me be known to me, I shall certainly tell thee truly. If on the other hand, the matter be unknown to me, I shall not say anything.' "'"The priest said, 'Every day, on occasions of obtaining my benedictions, when, again, I am engaged in the performance of religious rites on thy behalf, on occasions also of the Homa and other rites of propitiation, why is it that thou laughest upon beholding me? Seeing thee laugh at me on all occasions, my mind shrinks with shame. I have caused thee to swear, O king, that thou wouldst answer me truly. It does not behove thee to say what is untrue. There must be some grave reason for thy behaviour. Thy laughter cannot be causeless. Great is my curiosity to know the reason. Do thou speak truly unto me.' "'"The king said, 'When thou hast addressed me in this strain, O regenerate one, I am bound to enlighten thee, even if the matter be one that should not be divulged in thy hearing. I must tell thee the truth. Do thou listen to me with close attention, O regenerate one. Listen to me, O foremost of twice-born persons, as I disclose to thee what happened (to us) in our former births. I remember that birth. Do thou listen to me with concentrated mind. In my former life I was a Sudra employed in the practice of severe penances. Thou, O best of regenerate persons, wert a Rishi of austere penances. O sinless one, gratified with me, and impelled by the desire of doing me good, thou, O Brahmana, wert pleased to give me certain instructions in the rites I performed (on one occasion) in honour of my Pitris. The instructions thou gayest me were in respect of the manner of spreading the Vrishi and the Kusa blades and of offering libations and meat and other food to the manes, O foremost of ascetics. In consequence of this transgression of thine thou hast taken birth as a priest, and I have taken birth as a king, O foremost of Brahmanas. Behold the vicissitudes that Time brings about. Thou hast reaped this fruit in consequence of thy having instructed me (in my former birth). It is for this reason, O Brahmana, that I smile at sight of thee, O foremost of regenerate persons. I do not certainly laugh at thee from desire of disregarding thee. Thou art my preceptor.[25] At this change of condition I am really very sorry. My heart burns at the thought. I remember our former births, hence do I laugh at sight of thee. Thy austere penances were all destroyed by the instructions thou gayest me.