Mbh 12.352.1a

"'Brahma said,--"Listen, O son, as to how that Purusha is indicated. He is eternal and immutable. He is undeteriorating and immeasurable. He pervades all things.[1918] O best of all creatures, that Purusha cannot be seen by thee, or me, or others. Those that are endued with the understanding and the senses but destitute of self-restraint and tranquility of soul cannot obtain a sight of him. The Supreme Purusha is said to be one that can be seen with the aid of knowledge alone. Though divested of body, He dwells in every body. Though dwelling, again, in bodies, He is never touched by the acts accomplished by those bodies. He is my Antaratma (inner soul). He is thy inner soul. He is the all-seeing Witness dwelling within all embodied creatures and engaged in marking their acts. No one can grasp or comprehend him at any time. The universe is the crown of his head. The universe is his arms. The universe is his feet. The universe is his eyes. The universe is his nose. Alone and single, he roves through all Kshetras (Bodies) unrestrained by any limitations on his will and as he likes. Kshetra is another name for body. And because he knows all Kshetras as also all good and bad deeds, therefore he, who is the soul of Yoga, is called by the name of Kshetrajna.[1919] No one succeeds in perceiving how he enters into embodied creatures and how he goes out of them. Agreeably to the Sankhya mode, as also with the aid of Yoga and the due observance of the ordinances prescribed by it, I am engaged in thinking of the cause of that Purusha, but alas, I am unable to comprehend that cause, excellent as it is. I shall, however, according to the measure of my knowledge, discourse to thee upon that eternal Purusha and his Oneness and supreme greatness. The learned speak of him as the one Purusha. That one eternal Being deserves the appellation of Mahapurusha (the great supreme Purusha).