Mundaka Upanishad, Hinduism, Philip Novak:
There are two birds, two sweet friends, who dwell on the self-same tree. The one eats the fruits thereof, and the other looks on in silence. The first is the human soul who, resting on that tree, though active, feels sad in his unwisdom. But on beholding the power and glory of the higher Spirit [Atman], he becomes free from sorrow.
Mundaka Upanishad, Hinduism, in Novak, Philip. The World’s Wisdom (S.15). HarperOne. Kindle-Version.