When one door closes another door opens; but we often look so long and so regretfully upon the closed door that we do not see the ones which open for us.Alexander Graham Bell
当一扇门关上另一扇门打开；但我们常常在紧闭的门上看得太久，太遗憾了，以至于看不到为我们打开的门。——亚历山大·格雷厄姆·贝尔
https://www.forbes.com/quotes/253/