Read this excerpt from President Abraham Lincoln’s Gettysburg Address. We are met on a great battle field of that war. We have come to dedicate a portion of that field, as a final resting place for those who here gave their lives that that nation might live. It is altogether fitting and proper that we should do this.
But, in a larger sense, we can not dedicate—we can not consecrate—we can not hallow—this ground. The brave men, living and dead, who struggled here, have consecrated it, far above our poor power to add or detract.
Which rhetorical device does President Lincoln use most effectively in this excerpt?

imagery
hyperbole
irony
emotional appeal