340 letters where sadness is the subject — not the routine sign-off but a direct engagement with despair. Overwhelmingly concentrated in the 1950s (258 of 340), the post-war rebuilding decade. What emerges is a clinical doctrine: sadness is not a mark of sincerity but the yetzer's chief tactic. The tell — if guilt saps your energy for Torah, it's the yetzer, even dressed as fear of Heaven. The prescription: don't wrestle the thought; begin a concrete act. Daily self-accounting belongs to Elul; outside it, the audit does "more loss than gain."
The same lever that appears as an exception in the faith and health letters turns out, pulled together, to be a standing doctrine. Its center of gravity is the 1950s — letter after letter to broken, self-reproaching correspondents — and its counsel is strikingly consistent: the melancholy a person feels over his own failings does not come from holiness. It comes from the yetzer, and it is to be diverted, not honored.
The recurring moves, by how often each surfaces across the 340 letters.
Against these stands the one positive command he keeps returning to — עבדו את ה׳ בשמחה, "serve G-d with joy" (70 letters): joy is not a mood but the engine that makes the avodah itself greater and more successful.
He treats melancholy the way a physician treats a symptom: name its source, refuse to argue with it, and prescribe action. Even guilt that wears the mask of piety is unmasked by one test. Here, verbatim.