A shoemaker received a tract from a customer one day, and did not care to read it so he used it as part of the lining of a shoe he was making. The shoe with the hidden message was purchased, and used for a long time until it was well-worn and in need of repair.
It was taken to another shoemaker, who removed the worn-out sole and discovered the hidden messenger. He was immediately struck by the title, and read the whole message. It was the Word of God delivered to him in a most unusual way, and it awakened him to a sense of his sin and need of salvation. He turned his eyes in faith to Christ, and found salvation for his soul.
So go on with your work, tract distributor—"in the morning sow thy Seed, and in the evening withhold not thine hand: for thou knowest not whether shall prosper, either this or that, or whether they both shall be alike good" (Ecclesiastes 11:6).