首楞嚴義疏注經 4.12

4.12

「世尊！若復世間一切根、塵、陰、處、界等，皆如來藏清淨本然，云何忽生山河大地諸有為相，次第遷流，終而復始？」

"World-Honoured One! If all the worldly faculties, dusts, aggregates, sensory bases, and realms are originally pure in the tathāgatagarbha, why do conditioned marks such as mountains, rivers, and the great earth suddenly arise, successively changing and flowing, ending and beginning again?"