"The words of the immortal collection are hidden in my Dan seal, and some boxwood is left outside the mountain pavilion." Can the teacher help me explain the meaning of this couplet? thank you

The last sentence "Fairy Collection" hides my seal, which means copying fairy books. The next sentence leaves this boxwood outside the mountain pavilion, which means wishing Huang Lao's knowledge spread widely. The words I copied come from the teachings of the immortals, and the Tao and Dharma inside will spread to the outside of the Qing Dynasty.

Danzhuan literally means "written by cinnabar", which often refers to Taoist books. The mountain pavilion should be a place for monasticism. Boxwood grows slowly. In Taoist culture, boxwood is considered to be helpful to magical powers, similar to "Bodhi" representing Buddhism, in which boxwood represents Taoism.

Due to the need of language confrontation, the biography of Dan makes books and knowledge similar and concrete to boxwood.

Entrusted by Bao, Zhao carved the residual word "Yi He Ming" into couplets. Although the words have no deep meaning, the calligraphy is beautiful.