'On this there is this verse: "When all desires which once entered his heart are undone, then does the mortal become immortal, then he obtains Brahman. 'And as the slough of a snake lies on an ant-hill, dead and cast away, thus lies this body; but that disembodied immortal spirit (prana, life) is Brahman only, is only light.' Ganaka Vaideha said: 'Sir, I give you a thousand.'

In plain words: When every desire in a person's heart is gone, that mortal person becomes immortal and reaches Brahman. The dead body is left behind like the old skin a snake sheds on an anthill, while the true spirit is Brahman and pure light. King Janaka is so moved that he offers the sage a thousand as a gift.