481 letters (Holocaust-theodicy excluded — those are in their own dive), weighted toward the 1950s (271). The standing consolation: the soul ascends and does not descend; on the day of passing, all one's toil is revealed and illuminated. The signature departure: the truest comfort is composure and deed, not collapse. The departed is gladdened by the living's actions, not by their grief — and the living's addition in Torah and mitzvos in the departed's name is itself what brings true rest to the soul.
His consolation rests on a settled premise — the soul is not lost; it ascends, and on the day of passing "all the toil a person's soul labored at" shines forth (Igeres HaKodesh 28). But he never leaves the mourner there. The soul, he writes, finds its rest not in our grief but in our deeds; so the truest comfort is מנוחת הנפש — composure — and more Torah and mitzvos done in the departed's name.
The recurring notes he sounds in a letter of comfort, by how often each surfaces.
The largest note is not "the soul lives" but "turn the memory into a deed." Consolation, in his hands, is something the mourner does — the same active turn he presses against melancholy and against despair.
The soul lives, ascends, and keeps rising — that is the ground. But he refuses to let comfort end in sorrow. The departed finds rest in the living's deeds, not their grief; so the mourner's task is composure of mind and added Torah in the deceased's name. The bond is not severed — it is carried on. Here, verbatim.