摩訶止觀 4.106

4.106

第三、閑居靜處者，雖具衣食，住處云何？若隨自意，觸處可安；三種三昧，必須好處。好處有三：一、深山遠谷，二、頭陀抖摟，三、蘭若伽藍。

Third, regarding living in an idle, quiet place: although one has clothing and food, what of the dwelling place? If one follows one's own mind, one can find peace in any place; but for the three kinds of samādhi, one must have a good place. There are three good places: first, deep mountains and distant valleys; second, dhūta practice; third, an araṇya-saṅghārāma.