A very long time in the past in Korea, a well-known Sutra Master named Dae Oh Sunim traveled to Hae In Sah Temple lecture on the Hua Yen Sutra. He concluded his week‘s instructing by stating, “For forty-nine years, the Buddha taught just one phrase: ‘All issues are created by thoughts alone.'”
After the speak, there have been many questions and solutions. Then one younger Zen monk stood up and requested, “You stated that issues are created by thoughts alone. My query is: the place does this thoughts come from?” Dae Oh Sunim was fully caught, and couldn’t reply. Do you perceive? If not, go ask a tree. The tree will reply for you.
By Zen Master Seung Sahn’s commentary from The Whole World Is a Single Flower, #26: All Things Are Created By Mind Alone.