In this quote, Thoreau is using symbolism to compare big and often controversial thoughts, beliefs, and opinions to a bullet from a gun. It could also be argued that a hyperbole is being used as Thoreau was exaggerating when he said, “...else it may plow out again through the side of his head.”. Both of these figurative devices are effective because it makes a powerful connection in the reader’s head and draws attention to the seriousness of his statement. Thoreau likely used these devices to get his message across to his readers because people have notoriously been known to be very stubborn and have very strong opinions. By making such a strong comparison, it in a sense gives his readers a reality check about the impact their words and opinions
