When one door of happiness closes, another opens, but often we look so long at the closed door that we do not see the one that has been opened for us.
每当一扇幸福之门关闭，就会有另一扇幸福之门打开，但我们往往长久凝视着关闭的这扇门，而看不到已经打开的那扇门。 - —— 海伦・凯勒