我们都只是过客，像沙滩上的脚印一样留下自己的痕迹。
"We are all just passing through, leaving traces of ourselves behind like footprints in the sand."
Stray birds of summer come to my window to sing and fly away。 And yellow leaves of autumn， which have no songs， flutter and fall there with a sigh。
翻译：善行不积累不足以成就美名，恶行不积累不足以灭亡自身。
数学的本质在于其自由性。