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Yoga Sutras of Patanjali, Chapter 1, Sutra 7

"Direct perception, inference and revealed authority are the three categories of the vritti called valid proof, pramaana." Swami Veda Bharati
Explanation: The vrittis called pramaana, valid proof, concern correct knowledge of a thing that exists in reality, and include cognition derived from direct perception, pratyaksha where the mind contacts an external object by way of the senses which it had not encountered previously, inference, anumaana, where cognition is derived from a logical thought process, and testimony, aagamaah, where cognition is derived from hearing the words of a reliable person.

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