What is the author's plea to the readers in Chapter 15, and how does he use the ocean metaphor to convey his humility?

At the beginning of Chapter 15, the author makes a humble plea to the listeners, asking for their grace and undivided attention. He uses the metaphor of an ocean to describe the listeners, noting that an ocean accepts all rivers without discrimination, whether they are pure or muddy. The text states that even when filled limitlessly, the ocean does not turn back rivers. As detailed in Chapter 15, the author uses this powerful image to express his wish to immerse himself in the listeners, just as a humble stream finds its place in the vast ocean, and asks them not to desert him for this desire.