Read the excerpt from Gilgamesh: A New English Version. Gilgamesh backed away. He said, "How dreadful Humbaba's face has become! It is changing into a thousand nightmare faces, more horrible than I can bear. I feel haunted. I am too afraid to go on." Enkidu answered, "Why, dear friend, do you speak like a coward? What you just said is unworthy of you. It grieves my heart. We must not hesitate or retreat." Which sentence best states the theme of the excerpt?