What does the brave men living and dead who struggled here have consecrated it far above our poor power to add or detract?

This phrase suggests that the sacrifices made by those who fought and died at a particular location have imbued it with profound significance that transcends any Words or actions we might offer. Their bravery and struggle have given the site a sacred quality that honors their memory, making any attempts to enhance or diminish its importance futile. Essentially, it emphasizes the deep respect owed to those who have served and the lasting impact of their sacrifices.