一扇通往快樂的門關上時，其他的門會打開；但我們常花了太多時間盯著那扇關閉的門，卻看不到那些敞開的門。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 which has been opened for us.

一扇通往快樂的門關上時，其他的門會打開；但我們常花了太多時間盯著那扇關閉的門，卻看不到那些敞開的門。 — 海倫·凱勒 (Helen Keller)，美國身心障礙者及教育家

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 which has been opened for us.