If one reverts to the ultimately real, rejects conceptual discrimination, and abides in brightness [or luminosity, "gsal bal"], then one sees neither self nor other. Here the common man and sage are equal. If without shifting an inch one then abides in rock-like stability, one no longer chases after written teachings.
-Bodhidharmatara (Bodhidharma) on the practice of "Wall-Gazing." From a Tibetan manuscript discovered in the Tun-huang caves.