阿彌陀經疏 1.128

1.128

經曰：「極樂國土七重欄楯」，次釋第一下繞金欄也。《無量壽論》云：此即地莊嚴，寶欄周匝圍繞。《說文》云：欄，門遮也，楯，木欄也。按彼所釋，楯即遮遏之體，欄即防護之名，此即形淨土也。若第一義土，《華嚴經》云：清淨心為楯，即意無三惡為楯之體，七業不生即為欄之用。

The sūtra says: 'In the land of Sukhāvatī, there are seven tiers of balustrades.' Next is the explanation of the first [point], encircled below by golden balustrades. The Treatise on the Infinite Life Sūtra says: 'This is the adornment of the ground: jewel balustrades completely encircle it.' The Shuowen says: 'Lan means a barrier at a gate; shun means a wooden rail.' According to that explanation, shun is the substance that obstructs and blocks, while lan is the name for guarding and defending; this is the physical pure land. As for the ultimate land, the Avataṃsaka Sūtra says: 'A pure mind serves as the balustrade'—that is, the mind free from the three evil deeds is the substance of the shun, and the non-arising of the seven karmic actions serves as the function of the lan.