One day, when the brilliant Chinese Cha'n master Chao-chou was sweeping the court of the monastery, a man asked him:
-Ch'an monastery supposed to be clean and pure. Why is there dust to sweep?
Chao-chou replied:
-It came...
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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.