Mantras were originally conceived in the great Hindu scriptures known as the Vedas. Within practically all Hindu scriptures, the writing is formed in painstakingly crafted two line “shlokas” (Shloka is a verse, phrase, proverb or hymn of praise)and most mantras follow this pattern, although mantras are often found in single line or even single word combinations.
Aum(Aum (also Om) is the most sacred syllable in Hinduism, in which Vedic tradition it originated. The syllable is sometimes referred to as the “Udgitha” or “pranava mantra” (primordial mantra); not only because it is considered to be the primal sound, but also because most mantras begin with it.
The most basic hindu mantra is Aum, which in Hinduism is known as the “pranava mantra,” the source of all mantras. The philosophy behind this is the Hindu idea of nama-rupa (name-form), which supposes that all things, ideas or entities in existence, within the phenomenological cosmos, have name and form of some sort. The most basic name and form is the primordial vibration of Aum, as it is the first manifested nama-rupa of Brahman, the unmanifest reality/unreality. Essentially, before existence and beyond existence is only One reality, Brahman, and the first manifestation of Brahman in existence is Aum.
For this reason, Aum is considered to be the most fundamental and powerful mantra, and thus is prefixed and suffixed to all Hindu prayers. While some mantras may invoke individual Gods or principles, the most fundamental mantras, like ‘Aum,’ the ‘Shanti Mantra,’ the ‘Gayatri Mantra’ and others all ultimately focus on the One reality.
In the Hindu tantras the universe is sound. The supreme (para) brings forth existence through the Word (Shabda). Creation consists of vibrations at various frequencies and amplitudes giving rise to the phenomena of the world. The purest vibrations are the var.na, the imperishable letters which are revealed to us, imperfectly as the audible sounds and visible forms.
Var.nas are the atoms of sound. A complex symbolic association was built up between letters and the elements, gods, signs of the zodiac, parts of the body — letters became rich in these associations. For example in the Aitrareya-aranya-Upanishad we find:
“The mute consonants represent the earth, the sibilants the sky, the vowels heaven. The mute consonants represent fire, the sibilants air, the vowels the sun? The mute consonants represent the eye, the sibilants the ear, the vowels the mind”
In effect each letter became a mantra and the language of the Vedas, Sanskrit, corresponds profoundly to the nature of things. Thus the Vedas come to represent reality itself. The seed syllable Om represents the underlying unity of reality, which is Brahman.