Answer:
He really believes.
Step-by-step explanation:
Beowulf believes that he can "calm turbulence and terror" because he has already promoted many heroic acts, he is aware of his strength and his ability to resolve difficult and dangerous situations that promote good to society and give him honor, wealth and a good reputation . He has confidence that he can handle the problem masterfully. This can often seem like uncontrollable bravado or narcissism, but Beowulf has that confidence because of his experiences and his self-knowledge.