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I started a movie review a while back on It's a Wonderful Life, which contains a powerful message of heroic sacrifice of personal ambitions to serve others.

George sacrificed his lofty dreams for a cause that he only partly understood throughout his life, only to find out how great an impact he had made on the lives of people around him. The segment covering World War II and how the locals participated in it is another illustration of heroic actions, sacrificing their own lives (their time, families, undertakings) for the benefit of others, most of whom they would never meet and who would never know them.

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