I am a light set up to guide the mariner, and to warn him from the dangers which woul

I am a light set up to guide the mariner, and to warn him from the dangers which would otherwise be unmarked. I am a beacon, erected to preserve the lives of those who go down to the sea in ships. I am a buoy, which shows where the channel lies, and where there are marks to direct the way, I am not wanted. I am a lamp, which shows the way, and points out the path to be followed by those who would be