Betraying conjunctions

Counjunctions explicitly tell the reader to connect clauses the way the writer wants them connected. They're part of textual cohesion, and they allow the writer to guide readers through the facts to the opinions the writer wants them to come away with. It's the difference between "John bought the bike although Bob told him to" and "John bought the bike because Bob told him to", or "Zendia feels threatened by neighboring Latveria because the rebels are massed near its borders" and "Zendia feels threatened by neighboring Latveria although the rebels are massed near its borders".

But conjunctions can also tell the reader a lot about the writer - sometimes things the writer might not realize his conjunctions are betraying. Take this sentence from a guide to Catcher in the Rye:

Although he is intelligent and sensitive, Holden narrates in a cynical and jaded voice.