You may have seen Colin Firth recite this speech with Beethoven's 7th Symphony playing in the background, but it was in fact a real speech given by the real King George VI, about seven hours after prime minister Neville Chamberlain told the nation that Britain was officially at war with Germany.

You can hear the original recording (September 3, 1939) if you feel like being a King's Speech completist.

The king keeps it pretty brief, assuring his people that there's good reason for the war and promises that they will face the future together. He says they have been "forced into a conflict […] to meet a challenge of principle" (source). This "principle" is the meat of his speech. Like Churchill, he reminds the people of Britain how crucial it is to prevent the Nazis and their allies from, well, taking over the world.

He's a big-picture guy.

[…] the freedom of our own Empire and of the whole British Commonwealth of nations would be in danger. But far more than this the peoples of the world would be kept in bondage of fear and all hopes of peace and of the security of justice and liberty of nations would be ended. This is the ultimate issue which concerns us. (Source)

Finally, he ends with a message telling people to be strong: "There may be dark days ahead […] but we can only do the right as we see the right […] if one and all be resolutely faithful today, ready for whatever service or sacrifice it may demand, with God's help we shall prevail" (source). Like Churchill in the "Blood, Toil, Tears, and Sweat" speech, George VI ends on a solemn but optimistic note. They both promote the idea that with dedication to the cause and a united front, they will triumph over the evil that faces them.