of Hakuin's major concerns was the danger of what he called "Do-nothing Zen" teachers, who upon reaching some small experience of enlightenment devoted the rest of their life to, as he puts it, "passing day after day in a state of seated sleep". Quietist practices seeking simply to empty the mind, or teachers who taught that a tranquil "emptiness" was enlightenment, were Hakuin's constant targets. In this regard he was especially critical of followers of the maverick Zen master Bankei. He stressed a never-ending and severe training to deepen the insight of enlightenment and forge one's ability to manifest it in all activities. He urged his students to never be satisfied with shallow attainments, and truly believed that enlightenment was possible for anyone if they exerted themselves and approached their practice with real energy. Lay teachings An extremely well known and popular Zen master during his later life, Hakuin was a firm believer in bringing the wisdom of Zen to all people. Thanks to his upbringing as a commoner and his many travels around the country, he was able to relate to the rural population, and served as a sort of spiritual father to the people in the areas surrounding Shoin-ji. In fact, he turned down offers to serve in the great monasteries in Kyoto, preferring to stay at Shoin-ji. Most of his instruction to the common people focused on living a morally virtuous life. Showing a surprising broad-mindedness, his ethical teachings drew on elements from Confucianism, ancient Japanese traditions, and traditional Buddhist teachings. He also never sought to stop the rural population from observing non-Zen traditions, despite the seeming intolerance for other schools' practices in his writings. In addition to this, Hakuin was also a popular Zen lecturer, traveling all over the country, often to Kyoto, to teach and speak on Zen. He wrote frequently in the last fifteen years of his life, trying to record his lessons and experiences for posterity. Much of his writing was in the vernacular, and in popular forms of poetry that commoners would read. Calligraphy An important part of Hakuin's practice of Zen was his painting and calligraphy. He seriously took up painting only late in his life, at almost age sixty, but is recognized as one of the greatest Japanese Zen painters. His paintings were meant to capture Zen values, serving as sorts of "visual sermons" that were extremely popular among the