stylistic:tone, quality:correction, information:filtering, information:highlighting
Cultural aspect

By using evidentials, the Quechua culture has certain assumptions about the information being relayed. Those who do not abide by the cultural customs should not be trusted. A passage from Weber (1986) summarizes them nicely below:

Evidentials also show that being precise and stating the source of one's information is extremely important in the language and the culture. Failure to use them correctly can lead to diminished standing in the community. Speakers are aware of the evidentials and even use proverbs to teach children the importance of being precise and truthful. Precision and information source are of the utmost importance. They are a powerful and resourceful method of human communication.