There are two sides of life—the black, and white sides. This bottle on the black side has a black heart, and the other has a white heart. The one with the white heart has a rope of red, which suggests faith in Christ to save from sin. (Before the lesson, place the sash cord in the mouth of this bottle, tilt the mouth down, and the cork ball will fall into the neck of the bottle, acting as a wedge. A slight pull on the cord will tighten the wedge securely.)
Christians living on the white side of life should be interested in getting others to accept Christ. This bottle takes Christ to the bottle on the black side. The bottle with the black heart humbles himself, and receives the red rope. (As soon as the sash cord has been placed in this bottle, tilt it sufficiently to allow the ball to fall into the neck, and act as a wedge.) The bottle is being lifted. It is losing its black heart. (The sleeve will slip off easily.) It now has a white heart, and is being carried to the white side of life.
Paul realized the possibility of helping others to know Christ, and he said, "As a wise master builder, I have laid the foundation." The only foundation for any life is Christ as Saviour.