The main stylistic devices in no longer at ease?

In No Longer at Ease, author Chinua Achebe consistently adopts the third person omniscient point of view, but much of the novel is driven by dialog in the first person. The anonymous narrator feels sympathy for protagonist Obi Okonkwo but sees him as a callous, stubborn, opinionated young man who causes himself nearly as many problems as fate seems to drop upon him.