These two phrases mean the same thing and mean that the people of Ephraim consider themselves to be very prosperous. (See: [[rc://en/ta/man/translate/figs-parallelism]])
These two phrases mean the same thing and emphasize that the people of Ephraim consider themselves to be blameless. Learning that someone has sinned is spoken of as finding sin in that person. AT: "they will not discover that I have done anything sinful" (See: [[rc://en/ta/man/translate/figs-doublet]] and [[rc://en/ta/man/translate/figs-metaphor]])