The wise declare that true yoga is the firm control of the senses. In that state, one becomes deeply alert, for yoga is both the source and the dissolution of all things. Yet, the supreme Self cannot be reached by speech, nor by the mind, nor even by the eye. How, then, can one realize Him, except by one who truly affirms, “He is”? To know Him rightly, one must recognize His existence in both His manifest and unmanifest aspects, and only for the one who perceives Him as truly existing does His real nature become clear. When all desires that dwell within the heart are let go, the mortal becomes immortal, and right here, attains Brahman. When every knot within the heart is untied, then too the mortal becomes immortal—this alone is the highest teaching. Within the heart are said to be a hundred and one arteries; one of these rises upwards to the crown of the head. By traveling upward through this, one attains immortality, while the others, spreading in all directions, become the paths for departing from this world. The innermost Self, the person within, is of the size of a thumb and always resides in the hearts of all beings. With steady effort, one should draw Him out from one’s own body, just as a reed is drawn from its stalk. Know this Self as pure and immortal—know Him as pure and immortal. Nachiketas, having received this sacred knowledge and the entire discipline of yoga as taught by Death, became united with Brahman—unstained and beyond death. Whoever knows the Self in this way can also achieve the same. May He protect us both together; may He nourish us both together; may we work together with great energy; may our study be vigorous and enlightening; and may we never bear ill will toward each other.