Sometimes your joy is the source of your smile, but sometimes your smile can be the source of your joy.

Sometimes your joy is the source of your smile, but sometimes your smile can be the source of your joy.

有时候你的快乐是你微笑的源泉，但有时候你的微笑可以是你快乐的源泉。

-- Thich Nhat Hanh 一行禅师