The article discusses the history and importance of lighthouses. It notes that the modern lighthouse design originated in the 18th century when French inventor Augustin Fresnel developed lenses and reflectors to concentrate light into a bright beam visible from over 20 miles away. The design is still used today in automotive headlights and other devices. The article then draws a spiritual analogy, saying that as lighthouses guide sailors to shore, Christians should let their faith shine before others to guide souls to "salvation's shore." It challenges readers to examine how bright their own spiritual light is reflecting Christ's example.