The second-largest topic: 3,080 Hebrew letters and 256 English. Girls' education leads the counsel (364 letters, holding strong into the 1970s), followed by the holiness standard in schools — taharas hakodesh (338, peaking in the 1950s-60s, dropping to 37 by the 1970s). Warmth and pleasant ways appear in 150 letters. The signature departure, expressed in the same breath as "don't expel": never concede on substance. Pleasant ways — but without yielding (מבלי לוותר). Unlike the mussar tradition's rebuke-path, his is warmth held firm.
Chinuch is the second-largest topic in the whole collection, and again the 1950s carry it — 1,999 of 3,080 — the years of founding schools and a network of teachers across continents.
The recurring calls, by how often they appear across the 3,080 letters.
Girls’ education is the single most frequent chinuch call in the collection — a defining priority, not an afterthought.
Girls’ education leads (364) and, unusually, holds into the 1970s (82) when other formulas fade — the one chinuch priority he never stops pressing.
"Al taharas hakodesh" peaks in the 50s–60s (165→124) then drops to 37 in the 1970s — once the standard was established, it needed less repeating.
Warmth (150) is the method throughout — but, as §04 shows, warmth "without conceding." The pleasant manner never softens the substance.
The rule is kiruv — draw the child close, in pleasant ways. But the letters guard both edges. Never expel and never coerce — and never concede on substance: pleasant ways "without conceding" (מבלי לוותר), explicitly unlike the mussar path of dwelling on rebuke. And teach each child by his own way. Here those boundaries, verbatim.