It means: Like Qingshan, I stay in this world temporarily, but we will not stand still forever. We will eventually have to face separation and find a new destination.
The poem "I and Qingshan are both passers-by, nor returnees" comes from "Climbing the Stork Tower" by Wang Zhihuan, a poet of the Tang Dynasty. This poem reflects Wang Zhihuan's world-weariness. He laments that life is like floating clouds. No matter whether he is accompanying the scenery or walking alone, he cannot escape the cycle of life and death in the end. This is consistent with the idea of ??"forgetting both things and myself" in ancient Chinese philosophy, showing a relieved mentality.