公案  / gōng àn /
Gongans 
Description:
現成公案,了無遷變。入得門來,一見便見。
Occuring gongans are without changes,
Upon entering the gate, everything is understood.
References:
星雲大師全集【書法類】中華文化佛教名詞 名相 The Complete Works of Venerable Master Hsing Yun: Calligraphy-Terminology 
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