Is there any poem that can prove the sentence in the poem "Sword House", "Looking for the blue sky above, looking for the yellow earth below, and finding nothing in both places"?

The poem "Jia Xu" can confirm the pursuit that "he searched all over the sky, the sky and the grave, but failed, and he couldn't find the one he was looking for in these two places", that is, the road is long and Xiu Yuan is Xi. Swim back from it, in the middle of the water

Description: It is a long and dangerous road to go upstream to pursue her (him) and follow her (him). Looking downstream, she (he) seems to be in the middle of the river.

Introduction of the poem: This poem describes a lover's pursuit of his lover. Show the hero's persistent pursuit of love.