Across all four decades, one instruction stays the same, and it is a small one: spread the wellsprings of Chassidus outward. When the Baal Shem Tov asked Moshiach when he would come, the answer was “when your wellsprings spread outward” — so every person helps bring the redemption closer through his own everyday deeds. On this one subject the Rebbe departs from his usual advice. Everywhere else he tells people to work within nature and build a natural vessel; about the redemption he says the opposite — it is not distant or gradual but already at hand: open your eyes and see it. The tone also shifts decade by decade — the urgent wartime plea of the 1940s becomes teaching, then organized campaigns, and finally the hope of a redemption for the whole people together.
"May we merit the true and complete redemption" closes thousands of his letters. This dive isolates the letters where geulah is actually argued — where he says how it comes, when, and what we are to do about it. The center of gravity is the same lever he presses everywhere else: יפוצו מעינותיך חוצה — spread the wellsprings, and Moshiach comes.
The register moves. The war-years' most urgent slogan is retired once the war ends; the wellsprings lever endures; and by the 1970s the frame shifts from the collective to the personal-into-collective redemption.
The recurring claims about how the redemption comes, by how often each surfaces across the 528 letters.
Everywhere else he insists on a natural vessel — see a doctor, make a livelihood, trust is not passivity. Geulah is where he says the opposite: it will not come gradually, b'derech hateva, but by a sudden leap. And he refuses to let the yearning outrun the sober facts of the hour. Here, verbatim.