Let us listen to the sacred teaching of the Taittirīya Upaniṣad, as it unfolds the path of knowledge, devotion, and ultimate realization. The seeker begins with heartfelt invocations, yearning for renown among people, for excellence beyond all wealth. He calls upon Fortune, praying to both enter into her and to have her enter into him, seeking purification within her thousand branches. Just as waters flow downward and months pass into years, he wishes that students might come to him from all directions, ever increasing. He prays to the neighborly presence not to harm or abandon him. Turning to the mysteries of sound and cosmos, the scripture reveals the sacred utterances: 'bhūḥ', 'bhuvaḥ', and 'svaḥ'—the vyāhṛtis. Yet, the wise teacher of the Mahāchamasya tradition disclosed a fourth: 'mahaḥ'. This 'mahaḥ' is Brahman, the very Self, with all other deities as its limbs. 'Bhūḥ' is this earthly world, 'bhuvaḥ' the midspace, and 'svaḥ' the heavenly realm. 'Mahaḥ' is the sun, by whose radiance all worlds are made great. 'Bhūḥ' is fire, 'bhuvaḥ' is air, 'svaḥ' is the sun, and 'mahaḥ' is the moon, by which all lights are magnified. These are also the Rig, Sāman, and Yajur Vedas, with 'mahaḥ' as Brahman, by which all the Vedas are made great. In the vital breaths: 'bhūḥ' is the vital breath, 'bhuvaḥ' the downward breath, 'svaḥ' the diffused breath, and 'mahaḥ' is food, by which all breaths are nourished. Thus, these utterances are fourfold in four ways; whoever knows this knows Brahman, and all gods offer him homage. Within the heart’s space dwells the person of mind, immortal and golden. He abides at the source of the senses, where the palate hangs down, where the hair parts and the skull is pierced. In this sacred seat, 'bhūḥ' rests in fire, 'bhuvaḥ' in air, 'svaḥ' in the sun, and 'mahaḥ' in Brahman. One who realizes this attains sovereignty and mastery—over mind, speech, sight, hearing, and knowledge. Brahman is space as its body, truth as its nature, delight as life, mind as bliss, peace, fullness, and immortality. Thus should the ancient ones meditate. The scripture then describes the fivefoldness of all existence: earth, midspace, heaven, the directions, and their intermediates; fire, air, sun, moon, and stars; waters, plants, trees, space, and self—these are the external world. Internally, the vital breaths—prāṇa, vyāna, apāna, udāna, samāna; the senses—eye, ear, mind, speech, skin; and the bodily elements—flesh, muscle, sinew, bone, marrow. The sage declares: “All this is fivefold; by the fivefold, the fivefold is filled.” Om is Brahman, Om is all this. With Om, the reciter is invoked, the Sāman hymns are sung, the shastra texts are uttered, the Adhvaryu priest accepts, and the Brahman priest gives approval. With Om, the Agnihotra sacrifice is permitted, and the teacher proclaims, “I will speak Brahman.” Thus, one attains Brahman. The Upaniṣad then extols the unity of truth, austerity, study, and teaching. Truth, veracity, austerity, self-control, tranquility, the sacred fires, the Agnihotra, serving guests, helping humanity, procreation, and continuity of lineage—all are to be practiced alongside study and teaching of the sacred lore. “Truth,” declares Satyavacha; “Austerity,” says Taponitya; “Study and teaching alone,” asserts Naka, for this is the highest austerity. Triśaṅku’s recitation proclaims: “I am the one who shakes the tree of the world; my fame rises like a mountain peak. I am pure, uplifted, the possessor of wealth and horses, immortal, radiant, of keen intellect, bathed in immortality.” After the recitation of the Veda, the teacher instructs the student: “Speak the truth. Practice righteousness. Do not neglect study and teaching. Bring what is dear to the teacher, and do not cut off the line of progeny. Do not neglect truth, righteousness, welfare, prosperity, study, or duties to gods and ancestors. Regard your mother, father, teacher, and guest as deities. Practice only blameless actions. Follow the good deeds of your teachers. Respect Brahmins superior to you, offer them a seat, and give with faith, generosity, modesty, fear, and understanding. When in doubt about conduct, act as the wise and righteous Brahmins would, for this is the essence and secret of the Veda.” A final prayer is offered: “May Mitra, Varuṇa, Aryaman, Indra, Bṛhaspati, and Viṣṇu be auspicious to us. Salutation to Brahman, to Vāyu, the manifest Brahman. I have spoken what is right and true. May that protect me and my teacher. Om. Peace, peace, peace.” The second chapter begins: The knower of Brahman attains the Supreme. Brahman is truth, knowledge, infinity. One who knows Brahman, hidden in the cave of the heart, enjoys all desires with the all-knowing Brahman. From this Self arose space, from space air, from air fire, from fire water, from water earth, from earth plants, from plants food, and from food the person. The person is made of the essence of food, with head, wings, body, and tail. From food, all beings are born; by food they live, and into food they return. Food is the eldest, the universal remedy. Those who worship food as Brahman obtain all food. From the food-sheath, there is an inner self made of breath, which fills the food-sheath. This self is also of human form, with breath as head, vyāna and apāna as wings, space as body, earth as foundation. The gods, humans, and animals live by breath, the giver of all life. Worshipping breath as Brahman, one attains fullness of life. From the breath-sheath, there is another inner self made of mind, which fills it. This too is of human form, with the Vedas as its limbs and instruction as its body. From the mind-sheath, there is an inner self made of knowledge, which fills mind. This self is of human form, with faith, order, truth, concentration, and greatness as its parts. Knowledge performs sacrifice and actions; all gods worship knowledge as the highest Brahman. Knowing knowledge as Brahman, one attains all desires after casting off the body. From the knowledge-sheath, there is another self made of bliss, filling all within. This self is of human form, with delight, joy, great joy, bliss, and Brahman as its limbs. If one knows Brahman as non-existent, he becomes as though non-existent; if he knows Brahman as existent, he is known as existent. The inquiry arises: after death, does the ignorant or the knower attain that world? The Supreme desired, “May I be many, may I be born.” He performed austerity, created all, and entered into it, becoming both manifest and unmanifest, knowledge and ignorance, truth and falsehood. Truth became all this. In the beginning, there was non-existence; from that, existence was born. Existence shaped itself, becoming essence, and by obtaining essence, one becomes blissful. Without this bliss, who could breathe or live? In this invisible, unembodied, undefined, and unbased, one finds fearlessness. But making the slightest distinction brings fear, for duality is the root of fear. Out of fear of Him, the wind blows, the sun rises, fire, Indra, and Death run their course. This is the inquiry into bliss: imagine a vigorous young man, learned and wealthy—this is one measure of human bliss. A hundredfold greater is the bliss of the human gandharvas, and so on, ascending through divine gandharvas, ancestors, gods by birth and by works, the gods, Indra, Bṛhaspati, Prajāpati, and finally, the bliss of Brahman. For one who is learned and free from desire, each stage is multiplied a hundredfold. The one in the person and the one in the sun are one; knowing this, one attains the self made of food, breath, mind, knowledge, and bliss. Words and mind turn back from Brahman, unable to reach it. One who knows the bliss of Brahman fears nothing and regrets nothing, for he is filled with all these selves. The story of Bṛgu and Varuṇa is told: Bṛgu, son of Varuṇa, asks his father to teach him Brahman. Varuṇa instructs him to seek that from which beings are born, by which they live, and into which they enter. Bṛgu practices austerity and realizes: food is Brahman. He returns for deeper knowledge, and with further austerity, realizes breath is Brahman, then mind is Brahman, then knowledge, and finally, bliss is Brahman. This is the highest knowledge, and whoever knows thus becomes firm, abundant in food, offspring, cattle, radiance, and fame. The Upaniṣad prescribes vows: One should not despise food, for breath is food and the body is its eater; food is established in food. One should not reject food, for water is food and light is its eater. One should produce abundant food, for earth is food and space is its eater. One should not refuse anyone who seeks shelter, and when giving shelter, one must give food. The wise always have food ready for the guest, for as one gives, so it returns. Meditation is described: “Security” in speech, “acquisition and security” in breath, “action” in hands, “movement” in feet, “liberation” in the anus—these are human attributes. The divine attributes are “satisfaction” in rain, “strength” in lightning, “fame” in cattle, “light” in stars, “progeny, immortality, and bliss” in the generative organ, and “all” in space. Meditate on these as Brahman, and as one meditates, so one becomes: great, thoughtful, revered, possessed of Brahman, and destroyer of enemies. The teaching concludes: The Supreme Self, though entering all, remains unaffected. The individual self is truly the Supreme Self, unaffected by the cycle of enjoyment and suffering. The one in the person and the one in the sun—he is one. Whoever knows this, upon departing this world, attains all selves and moves among all worlds, obtaining all desires. In a final song of realization, the sage proclaims: “I am food, I am the eater of food, I am the maker of verses. I am the first-born of the true, at the navel of immortality. Whoever gives me, protects me. I, as food, eat the eater of food. I have encompassed the world. I am radiant like the sun. Whoever knows this—this is the Upaniṣad.