閉關  / bì guān /
Retreat 
Category:
Buddhist Terminology 
Description:
閉關容易守關難,不肯修行總是閑, 身在關中心在外,千年不出也徒然。
Easy it is to enter a retreat, harder to stay in one,
Refusing to practice, one is always but idle;
Though the body stays in, the mind wanders out,
Not even a thousand years in there will help.
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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