I love the way this poem brings out how God shines for all the world to see. The lighthouse shines to bring the ships safely to shore, but it's up to the sailor to go towards the light, trusting that light to bring the boat to safety.
The sailor can choose to go his or her own way, which usually leads to peril. Jesus shines brightly through the world, but many choose not to follow His guiding light. They are blinded by their own light and their own desires and cannot see the way to eternal safety that only the Lighthouse of the world can provide. Unlike the man-made lighthouses, where the light can burn out, God's light never burns out. He is always there lovingly guiding us home to safety.