“The first type of Pramāṇa, Pratyakṣa, arises from the continuous active link,
through the mind and senses, between Jīva and the object it perceives.
The second type, Anumāna, is when present perception is
based on what has been seen in other situations in the past.
For instance, when I see dark clouds, I think that it may rain.
With the third type, Āgamā, undistorted words from
a reliable source are the basis for perception.
The Veda are Pramāṇa by virtue of their source.
The sage Āpastamba proclaimed that the Veda are Pramāṇa for Dharma.”
– T Krishnamacharya on Yoga Sūtra Chapter One verse 7