No, not that Hallelujah is a transliteration of the Hebrew word הללו יה, meaning “Praise Jah” (from the first two letters of YHWH).
THAT everybody knows.
No, it was amazing to discover that the Jesus story was anticipated eight hundred years ahead of time by the Prophet Isaiah. We are in good company. Saint Jerome (c. 342–420) also discovered it. “He was more of an Evangelist than a Prophet,” he wrote, “because he described all the Mysteries of the Church of Christ so vividly that you would assume he was not prophesying about the future, but rather was composing a history of past events” (Wikipedia).
The alto recitative – #8 in Part 1 – Behold a virgin will conceive was written by the Prophet Isiah, as was the aria #23, He was despised and rejected, and the Chorus #12 – For unto us a child is born, and the government shall be upon His shoulder and His name shall be wonderful.
Trust the angry old prophet with his messianic vision, 800 years before the event, to have originated not only the virgin birth but also the Christmas story.
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A video about life at the University of Toronto in 1942 has been posted on YouTube.