Mbh 3.188.1d

O Brahmana, alone do I set a-going the wheel of Time; I am formless; I am the Destroyer of all creatures; and I am the cause of all efforts of all my creatures. O best of Munis, my soul completely pervadeth all my creatures, but, O foremost of all regenerate ones, no one knoweth me. It is me that the pious and the devoted worship in all the worlds. O regenerate one, whatever of pain thou hast felt within my stomach, know, O sinless one, that all that is for thy happiness and good fortune. And whatever of mobile and immobile objects thou hast seen in the world, everything hath been ordained by my Soul which is the Spring of all existence. The grandsire of all creatures is half my body; I am called Narayana, and I am bearer of the conch-shell, the discus and the mace. O regenerate Rishi, for a period measured by a thousand times the length of the Yugas, I who am the Universal Soul sleep overwhelming all creatures in insensibility. And, O best of regenerate Rishis, I stay here thus for all time, in the form of a boy though I am old, until Brahma waketh up. O foremost of Brahmanas, gratified with thee, I who am Brahma have repeatedly granted thee boons, O thou who art worshipped by regenerate Rishis! Beholding one vast expanse of water and seeing that all mobile and immobile creatures have been destroyed, thou wert afflicted with melancholy. I know this, and it is for this that I showed thee the universe (within my stomach). And while thou wert within my body, beholding the entire universe, thou wert filled with wonder and deprived of thy senses. O regenerate Rishi, it is for this that thou wert speedily brought out by me through my mouth. I have (now) told thee of that Soul which is incapable of being comprehended by the gods and the Asuras. And as long as that great ascetic, the holy Brahma, doth not awake, thou, O regenerate Rishi, canst happily and trustfully dwell here.