金剛經纂要刊定記 5.85

5.85

塵勝經。問答之文可見。釋意云：所言塵者，非煩惱塵但是地塵。所言世界者，非染因界但是地塵界。此即躡前校量中來。由前說河沙寶施不及持經，惑者所聞未能誠信。所以如來特說此義，使其明見優劣用滌所疑。具在疏文昭然可見。

"Dust being superior": the text of the questions and answers is evident. The explanatory meaning is: what is called dust is not the dust of afflictions, but merely earth-dust. What is called a world is not the realm of defiled causes, but merely a realm of earth-dust. This follows from the preceding comparison. Because it was previously stated that a gift of jewels equal to the sands of the river does not equal upholding the sūtra, the confused who heard it could not yet genuinely believe. Therefore the Tathāgata specifically preached this meaning to make them clearly see superiority and inferiority and thereby cleanse their doubts. It is fully and clearly evident in the commentary text.