Letters by a Modern Mystic, first published in 1937, is a compilation of excerpts from letters that Laubach wrote to his father. The tremendous results of this experiment in living in moment-by-moment communion with God are found in the narrative of these letters. Dr. Laubach is probably best known for his work to address adult illiteracy in the world. He conceived a simple method of instruction that permitted even the most disadvantaged people in the world not only to learn to read but also to be able to teach others. "Each One Teach One" became the slogan for this instructional program, which is credited with equipping over one hundred million people with the ability to read. On September 2, 1984, the United States Postal Service issued a stamp commemorating the 100th anniversary of Laubach's birth