How we cite our quotes: Citations follow this format: (Book.Chapter.Paragraph)
Quote #4
He reached home damp and weary enough after his ten-mile walk. It had hardly been a propitious beginning, but he had chosen his course, and would show no swerving. (6.3.8)
It's interesting that both of the Yeobright cousins have scenes in which they consider the "course" they have chosen, and it's definitely interesting that both of them deliberately chose their life path and then stubbornly stick to it.
Quote #5
The game fluctuated, now in favour of one, now in favour of the other, without any great advantage on the side of either. [...] But neither of the men paid much attention to these things, their eyes being concentrated upon the little flat stone, which to them was an arena vast and important as a battle-field. (3.8.12-13)
Gambling as a metaphor for fate almost borders on the cliché, it's been used so often. But that doesn't mean it isn't an effective comparison, and it certainly works well in this book, given that fate, like gambling, is highly unpredictable. It's also interesting that Damon and Diggory are so intent on the "battle-field" that they don't notice or consider the implications of their actions, much like how people don't tend to notice the bigger picture or the workings of the universe around them.
Quote #6
She had calculated to such a degree on the probability of success that she had represented Paris, and not Budmouth, to her grandfather as in all likelihood their future home. Her hopes were bound up in this dream. (4.1.4)
The word choice here styles Eustacia as a sort of gambler against fate and the universe. She "calculates" the odds and banks on the "probability" of going to Paris eventually. Eustacia should have taken a statistics class.