| Quote #4
[Katerina] spoke with a sort of strain, in a sort of pale, forced ecstasy [...] "I will be his god, to whom he shall pray – that at least, he owes me for his betrayal." [4.5.10)
Quote #3 from earlier in the chapter has prepared the reader to see this passage as an instance in which Katerina's desire to be a "god" is shown as ridiculous.
| Quote #5
"And if the suffering of children goes to make up the sum of suffering needed to buy truth, then I assert beforehand that the whole of truth is not worth such a price." (5.4.21)
Ivan poses suffering as a theological problem here: if sweet innocent children suffer, how can there be a just God? This sounds a false note, though – Ivan doesn't really seem to care about suffering children.
| Quote #6
But at the moment he could no longer reason [...] his soul was troubled, troubled to the point of suffering. (8.6.2)
Personal suffering leads Dmitri to lose his ability to think rationally.