The Vedas
The Vedas are the oldest layer of Hindu scripture — a body of Sanskrit texts composed and transmitted orally for centuries before ever being written down, treated as shruti, "that which is heard," rather than authored by any one person. There are four of them — Rigveda, Samaveda, Yajurveda and Atharvaveda — each built around a core collection of hymns and mantras (the Samhita), with three further layers added over time: ritual explanation (Brahmana), forest-dwelling contemplation (Aranyaka), and philosophical inquiry (Upanishad). Together they move from praise and ritual toward the abstract questions — what is real, what is the self, how did the universe begin — that later became the foundation of Vedanta.
"Veda of Praise" (from ric, a hymn of praise) — the foundational collection of hymns to the Vedic gods, and the oldest of the four.
Hymns of praise and invocation to deities such as Indra, Agni, Soma and Varuna, composed for recitation at fire sacrifices; the most literary and philosophically wide-ranging of the four, especially in its late Mandala 10.
The 1,028 hymns themselves, arranged in ten mandalas — the family books (2–7), attributed to specific sages' lineages, form the oldest core; Mandalas 1 and 10 are later additions and contain the most philosophically developed material.
Prose texts (chiefly the Aitareya and Kaushitaki Brahmanas) explaining the meaning and correct procedure of the rituals in which Rigvedic hymns were used.
"Forest texts" — the Aitareya Aranyaka — meant for study away from settled life, bridging ritual explanation and the more abstract inquiry of the Upanishads.
Philosophical treatises attached to the Rigveda tradition, of which the Aitareya Upanishad is the best known.
"Veda of Melodies" (from saman, a chant) — a hymnal for singing, not a source of new content.
Almost entirely musical rather than textual: the same verses found in the Rigveda are given notated melodies (samagana) for the Udgatri priests to chant during Soma sacrifices. It preserves some of the oldest surviving musical notation in the world and is the traditional root of Indian classical music.
Divided into an Arcika (the verse text, largely borrowed from the Rigveda) and a Gana (the melodic settings of those verses for chanting).
Several Brahmanas (including the Panchavimsha and Jaiminiya Brahmanas) explain the Soma ritual context in which these chants were used.
A smaller and less prominent layer than in the other Vedas, associated with the Jaiminiya and other Samaveda schools.
The Chandogya Upanishad, one of the largest and most influential Upanishads, belongs to this tradition, along with the shorter Kena Upanishad.
"Veda of Sacrificial Formulas" (from yajus, a formula recited during a rite) — the priest's liturgical handbook.
Practical liturgy in prose and verse — the exact words a priest speaks while performing a sacrifice (yajna), including instructions for placing the fire, offerings and ritual objects. Unlike the Rigveda's hymns of praise, most of the Yajurveda is functional, spoken ritual language.
Exists in two major traditions: the Shukla ("White") Yajurveda, which keeps ritual formulas separate from their prose commentary, and the Krishna ("Black") Yajurveda, which interweaves formulas with explanatory prose in the same text.
The Shatapatha Brahmana ("Brahmana of a Hundred Paths") is the major commentary for the Shukla tradition and one of the most detailed of all Vedic prose texts; the Krishna tradition's Brahmana material is folded into its Samhita.
The Taittiriya Aranyaka (Krishna Yajurveda) and the Brihad Aranyaka (Shukla Yajurveda) mark the transition from ritual to contemplative material.
Home to two of the oldest and most important Upanishads: the Brihadaranyaka Upanishad (the largest of all Upanishads) and the short, dense Isha Upanishad, along with the Taittiriya, Katha and Shvetashvatara Upanishads.
Named for the Atharvan priests associated with it — sometimes called the "Veda of Magic Formulas," though it also contains serious philosophy.
The most folk-oriented and down-to-earth of the four Vedas: charms and spells for healing, protection, love, prosperity and household life sit alongside domestic rites (marriage, funerals) and, in its later portions, sophisticated philosophical hymns on the nature of being and the self.
Survives in two recensions — the widely studied Shaunaka and the less common, more esoteric Paippalada — organized in 20 books mixing practical charms, domestic ritual hymns, and philosophical material.
The Gopatha Brahmana is the sole surviving Brahmana of the Atharvaveda tradition.
A comparatively minor layer in this tradition; much of the Atharvaveda's speculative material appears directly within its later Samhita hymns rather than in a distinct Aranyaka corpus.
Includes some of the most quoted Upanishads: the Mundaka Upanishad (source of the "two birds on one tree" image and the phrase satyameva jayate), the Prashna Upanishad, and the very short but influential Mandukya Upanishad, which is devoted entirely to the syllable Om.
Rigveda 3.62.10, attributed to the sage Vishwamitra, is the single most widely chanted Vedic verse — a prayer to Savitr, the sun as source of divine illumination, asking that it awaken and guide the reciter's intellect. It is recited daily by millions and forms part of the sacred-thread (upanayana) ceremony.
Om bhur bhuvah svah, tat savitur varenyam, bhargo devasya dhimahi, dhiyo yo nah prachodayat — "We meditate on the glorious light of the divine Sun (Savitr); may it illuminate and guide our intellect."
Rigveda 10.129, one of the latest and most philosophically striking hymns in the collection. Rather than asserting how the universe began, it questions whether even the gods know — ending in genuine, unresolved uncertainty. It is frequently cited as an early example of philosophical skepticism and is sometimes compared, loosely, to modern questions about the origin of the cosmos.
Then there was neither existence nor non-existence... Who really knows? Who can declare it? Whence was it produced? Whence is this creation? The gods came afterwards, with the creation of this universe. Who then knows whence it has arisen? He, the first origin of this creation, whether he formed it all or did not form it — he who surveys it all from highest heaven, he knows, or perhaps even he does not know.
Rigveda 10.90, a 16-verse hymn describing the cosmic being Purusha whose primordial self-sacrifice gives rise to the universe, the Vedas, the gods, and the varna social divisions. It is one of the most reproduced Vedic hymns, also appearing in the Yajurveda, Samaveda and Atharvaveda, and remains part of everyday temple recitation today.
Peace invocations recited at the opening and close of Upanishadic study, meant to still the mind, body and surroundings before philosophical inquiry begins. Different Upanishads carry their own shanti mantra; the one prefacing the Isha Upanishad ("Om purnam adah, purnam idam...") is especially well known for its meditation on wholeness — that what is taken from the infinite remains infinite.
Found in the Taittiriya Samhita of the Krishna Yajurveda, this hymn addresses Rudra (an early form of Shiva) in his many manifestations across nature and society, alternating between awe and appeasement. It remains one of the most chanted hymns in Shaiva worship, especially during Maha Shivaratri and daily Rudrabhishekam rites.