觀無量壽佛經疏 3.97

3.97

十九、從作是觀者下，至名為邪觀已來，正明辨觀邪正相。斯乃華依寶地，葉間奇珍，臺瑩四幢，光施佛事。

Nineteenth, from "Those who practice this contemplation" down to "is called incorrect contemplation" directly clarifies distinguishing the marks of correct and incorrect contemplation. This refers to the blossoms relying on the jeweled ground, rare treasures among the petals, the platform gleaming with four banners, and the light performing Buddha-works.