Imam Ali (AS) said:

Beware, indeed this Quran is an advisor that does not deceive, and is a guide which does not misguide, and is a speaker that never lies. A person does not become a companion of the Quran unless (the Quran) adds or deducts from him/her. The Quran adds to his/her guidance, and deducts from his/her inwardly blindness and misguidance [1].

[1] Nahul Balaghah, Sermon 176.

Source: en.shafaqna.com