Nan-in, a Japanese master during the Meiji era (1868-1912), received a university professor who came to inquire about Zen.
Nan-in served tea. He poured his visitor's cup full, and then kept on pouring.
The professor watched the overflow...
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to the group in the Deer Park near Varanasi, the Buddha spoke of the Four Noble Truths. The Four Noble Truths sum up, in a systematic formula, the central teaching of the Buddha.