One who contributes from his wealth for the purpose of writing or publishing a sefer of a Tzaddik –
Behold, at any given time, and in any corner of the world, that a person studies from this sefer, the Tzaddik [on high] evokes merit on behalf of the donor through whom the sefer was disseminated.
—The Rebbe, Igrot Kodesh, vol 2
Known for their profound mystical insights, the works of the Mitteler Rebbe, Rabbi Dovber, were delivered at various times and transcribed by himself.
Most remained unavailable to the public and accessible only in the archive of the Lubavitch Central Library, until the process of publishing began in 5785/1984, at the behest of the Lubavitcher Rebbe.
These discourses are drawn from hundreds of manuscripts.