。
Literature teaches us about human nature.
Literal
Literature [topic-は] us [target-に] human-nature [about-について] teach gives.
我々 (われわれ) is a formal 'we,' belonging to written or formal spoken register and notably more elevated than 私たち. ~に~について教えてくれる stacks two prepositional senses: に for the indirect object (us) and について for the topic (human nature).