Hakuin Ekaku - Wikipedia, the free encyclopedia:
"Much of Hakuin's practice focused, as his teachings did, on zazen and koan practice. His motto was "meditation in the midst of activity is a thousand times superior to meditation in stillness". Hakuin's experiences of enlightenment seemed to come at unexpected moments, often when he was just walking or reading. One experience that he wrote about took place while he was walking through a torrential rain. As the water reached his knees, he suddenly realized the meaning of a particular verse that he had read earlier, and was seized by enlightenment. He had many such experiences, both large and small. Laughter was a large part of Hakuin's reaction to his enlightenments, and he was known to burst into spontaneous laughter upon realizing the essence of a particular koan, causing those around him to believe him to be a madman."
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