相知无远近，万里尚为邻。
True friendship knows no distance; even ten thousand li apart, we are still neighbors.
—— 张九龄
Source: 送韦城李少府(Seeing Off Li Shaofu)
Background
From Zhang Jiuling's "Farewell to Li Shaofu of Wei City," expressing understanding and cherishing of the depth of friendship.
Interpretation
True understanding and friendship are not about geographical distance, but about spiritual connection. Even separated by thousands of miles, friends with connected hearts remain as close as neighbors.