Tao Te Ching

“Two monks were arguing about a flag. One said, 'The flag is moving.' and the other said, 'No, the wind is moving.' their teacher happened to be passing by and told them, 'Not the wind, not the flag; it is your mind that is moving.'”

— Mumon Ekai 無門慧開 1183 – 1260 CE
(Wumen Huikai)
Pioneering pathfinder to the Gateless Gate

from The Gateless Gate, 無門関, 無門關