Intelligence
If I were exiled to a desert island and only allowed to take a dozen books with me, one of them would be the Vivekachudamani or “Crest Jewel of Wisdom” by Adi Shankara.
“The Intelligence, together with the powers of intelligence, makes the intelligence-formed vesture, whose distinguishing character is actorship; it is the cause of man’s circle of birth and death.The power which is a reflected beam of pure Consciousness, called the understanding, is a mode of abstract Nature; it possesses wisdom and creative power; it thereby focuses the idea of “I” in the body and its powers.”
–Shankara (a.k.a. Adi Shankaracharya, Indian Sage, Spiritual Teacher and Author of the Crest-Jewel of Discrimination, Dates Uncertain, but c.A.D. 686-718 or 788-821)
Various translations are available online, and I particularly like this book version. (Yes, I know, it’s made of paper, but sometimes I prefer that to bouncing photons):
“Shankara’s Crest Jewel of Discrimination” (Swami Prabhavananda, Christopher Isherwood)