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?
When beauty is abstracted
Then ugliness has been implied;
When good is abstracted
Then evil has been implied.
So alive and dead are abstracted from nature,
Difficult and easy abstracted from progress,
Long and short abstracted from contrast,
High and low abstracted from depth,
Song and speech abstracted from melody,
After and before abstracted from sequence.