(There is book by the Physician of the Muslim Nation, Reviver of Muslim Community Hazrat Maulana Ashraf Ali Thanwi, may Allah Almighty fill his tomb with light, called the Mentoring the Traveler (Tarbiatus-Salik). This is based upon the letters written to him by his disciples together with his answers. This is a multivolume work.)
Once he asked for something to be read from Mentoring the Traveler. When a letter was read from the book he wondered allowed, "What could be the answer to that?"
Then he asked for the answer, written by him, to be read. On hearing the answer he said, "Was it really me who wrote that?"