B"H, 5 Iyar, 5715.
Brooklyn.
Havavch iy"a nu"n etc. Tzvi Sonnenfeld
Shalom u'Vrachah!
I am interested to know if they have printed the letters of your grandfather, the harav and harach etc. Mohari"ch a"h Sonnenfeld, or if they are being prepared for printing in the near future. Surely his descendants are involved in this, as our Sages said: how much did he desire that his lips would move [in the grave, through Torah study from his words], etc.
Summary
The Rebbe encourages the preservation and publication of Torah correspondence from great leaders like Rabbi Yosef Chaim Sonnenfeld, highlighting the merit and spiritual benefit for both descendants and readers.