This, in fact, distinguishes Indian philosophy from much of Western philosophical thought.
The oldest and most important scriptures of Hinduism are the Vedas, which contain inspired utterances of seers and sages, who had achieved a direct perception of the divine being.
When, in the eighteenth century, the first translations of some Upanishads and the Bhagavad Gita became available to the West, European philosophers rhapsodized about the profundity and beauty of these writings.
Here they encountered a fusion of philosophy and religion, a deep wisdom and a concern with the ultimate, that had no parallel in either contemporary Western philosophy or Western religion.
From the Vedas they evolved the Upanishads, whose copious enquiries into the nature of man, the Universe, and God, strike us with speechless wonder.
Their intellectuals vying with each other, propounded six systems of philosophy explaining man, universe, and God, before which Aristotle's and Plato's theories look like juvenile endeavors, which fell flat on their own country-men.
Sruti include the Vedas (Rig, Yajur, Sama and Atharva) and the Bhagavad Gita. Each of the four Vedas consists of four parts: Samhitas, Brahmanas, Aranyakas, and Upanishads.
in Sanskrit means "that which is heard." Thus the Vedas are the eternal truths that the Vedic seers, called rishis, are said to have heard during their deep meditations.
They discovered the Earth's dual motions, and studied the courses of constellations and stars, and founded the twin sciences of astronomy and astrology.
They probed the human frame, and perfected a system of medicine for the welfare of the body, evolved the science of Yoga for the health of the mind, and the Tantra Shastra to develop the psychic and esoteric forces latent in man's being.
No other living tradition can claim scriptures as numerous or as ancient as Hinduism; none of them can boast of an unbroken tradition as faithfully preserved as the Hindu tradition.
Hindu literature is the most ancient and extensive religious writings in the world. It has many sacred writings which serve as a source of doctrine.