Piyanlu 18.2:
One day an old lady told Te-shan that if he could point to one of the three thoughts mentioned in the Diamond Sutra she would give him a “thought-pointing” cake (the literal meaning of the Chinese tien-hsin [little snack]). Unable to do so, he gave up his literary pursuits (in his baggage was a 120- volume commentary he had written on the Diamond Sutra) and began his study of Zen. (Piyenlu: 4)