觀彌勒上生兜率天經贊 2.31

2.31

贊曰：此有二嚴。六地作十二因緣觀，厭生死苦樹，感七寶樹故。思慧風動樹，觀緣起故。七寶樹者，七十七智觀所引故。七地純作真無相觀，證法性色，感妙色故。

The commentary says: Here there are two adornments. On the sixth ground, one performs the contemplation of the twelve links of dependent origination and becomes revulsed by the tree of the suffering of birth and death; hence it karmically brings about the trees of seven jewels. The wind of reflective wisdom moves the trees, because one contemplates dependent arising. As for the trees of seven jewels, they are induced by the contemplation of the seventy-seven wisdoms. On the seventh ground, one solely performs the contemplation of true signlessness and realizes the form of the dharma-nature; hence it karmically brings about the wondrous colours.