How we cite our quotes: Citations follow this format: (Book.Chapter.Paragraph)
Quote #4
It was the room in which, six months earlier, the merry Christmas party had met. [...] The only living thing that entered now was a sparrow. [...] This roused the lonely sitter, who got up, released the bird, and went to the door. (3.7.1)
This entire chapter is a painful portrait of loneliness. In this scene, we get a sense of how Mrs. Yeobright is haunted by past memories in her lonely house. It's also worth noting the bird in this scene – you can read more about "Bird" imagery and symbolism in the "Symbols, Imagery, Allegory" section.
Quote #5
A domestic drama, for which the preparations were now being made a mile or two off, was but little less vividly present to her eyes than if enacted before her. She tried to dismiss the vision, and walked about the garden-plot, but her eyes ever and anon sought out the direction of the parish church [...]. (3.7.2)
There's a dual sense of isolation and connection going on here. It's like Mrs. Yeobright's mind is completely at the church where her son is getting married, even though her body is still at her lonely home. The detail about how her eyes keep "seeking" out the church is key here.
Quote #6
The absolute solitude in which they lived intensified their reciprocal thoughts; yet some might have said that it had the disadvantage of consuming their mutual affections at a fearfully prodigal rate. (4.1.2)
Though solitude and isolation are often portrayed negatively, we see here that isolation can also be romantic and happy. But, of course, this passage doesn't end on a happy note. Instead, we get an ominous warning about how Clym and Eustacia are going to (literally) burn themselves out at the rate they are going.