In "Farewell to Deputy DuDu's appointment in Shu", seeing friends off shows free and easy meaning.

Farewell to the viceroy and go to Shu for his post.

Bo Wang

Across the wall of Sanqin, across a layer of fog, across a river.

We said goodbye sadly, and our two officials went in opposite directions.

After all, the world is just a small place.

Why are you wandering at the fork in the road? The child is holding a towel.

However, as long as China keeps our friendship, heaven is still our neighbor.

It means: As long as there are close friends in the four seas, even if they are far away in Wan Li, they are close at hand.