The language that people typically use on a daily basis tends to be subjective, which is riddled with opinions and based primarily on a value system or personal preference. Although it is possible for an opinion to be based on evidence, opinions tend to lack strong verifiable support.
As a college instructor, one of my favorite tidbits of advice is to “question everything!” When I first introduce the phrase, I see scrunched up faces. By the end of the semester, students tend to get what I mean by that; don’t just believe it. It is important to objectively approach an idea to make sure that there’s support for a claim instead of allowing oneself to be duped by a charismatic leader or be pulled in by an emotional appeal.
I’ve heard it said that passion rules reason. In the case of being objective, one should strive to make sure that reason rules passion.