In plain words
“Śṛṇvantu viśve amṛtasya putrāḥ”: man is a child of immortality. Yamadharmarāja taught this very Satya to Naciketas. “Naciketas! Recognise that source from which you have come. The body is like a bubble of water. The mind is nothing but restless. Forget these two, and recognise the Satya that matters above all, the Satya that is the root and support,” he said.
“With the digit of the moon glittering on His crest, with a cluster of matted locks in all their beauty, with the sparkle of the river of heaven flowing in those locks, with the splendid eye upon His brow, with a throat as black as the dark nēreḍu fruit, with a serpent bracelet on His hand, with the elephant's hide wound about His waist, with ash smeared over His whole body, with the large vermilion mark drawn on His forehead, with lips reddened by betel, glorious in all six śāstras, laughing at the dark lilies and outdoing them, with His body of gleaming dusky hue....
In this way the nature of Īśvara is filled with splendours that charm and enrapture the world itself. You need not search for that nature of Īśvara. You yourself are That. You are not the body, which is physical, worldly and gone in a moment. You are none other than the principle of the Ātma, eternal Satya. To recognise this Satya you must see with the eye of Jñāna, not with the eyes of flesh. Cattle, birds and beasts, worms and insects too keep on seeing this world with the eyes of flesh.