不二  / bù èr /
Non-Duality 
Category:
Buddhist Terminology 
Description:
不二法門無言無說,心真如門認識自我。
The teachings of non-duality are beyond words;
The gate of True Thusness recognizes oneself.
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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