Now, to understand this about the meditator and what is meditated upon, I will go to a beautiful and very important mantra from the Ishavasya Upanishad, one of the most important Upanishads:
Om isa vasyamidam sarvam yatkincha jagatyam jagat
Tena tyaktena bhunjitha ma grdhah kasyasviddhanam
I have quoted the first verse of the Ishavasya Upanishad in its original Sanskrit form to bring out the beauty of the language. Knowledge is important to everyone; everybody wants knowledge. If you just look around the world, at the number of universities and institutions that help you acquire knowledge, you will see how important knowledge is.
It’s because of knowledge that we have come so far. However, there is another aspect of knowledge. And one of the ancient texts—an ancient Upanishad that deals with this question of knowledge is the well-known Ishavasya Upanishad. It is among the eleven principal Upanishads, commented on by the great Shankaracharya, Ramanujacharya, Madhva, and various other interpreters.