"When one door closes, another opens. But we often look so long and so regretfully upon the closed door that we do not see the one which has opened for us." - Alexander Graham Bell (「一つの扉が閉じても、別の扉が開く。しかし私たちは長い間残念そうに閉じた扉ばかり見ているので、開いている扉に気づかない。」 - アレクサンダー・グラハム・ベル)