Why did that writer write what they wrote?
What was the underlying premise for that opinion to be formulated?
These are the questions that not only scholars, but all writers should incorporate. Even in fiction why is your character doing what they are doing, saying what they are saying, or, in general, described the way they are? This is fundamental to good writing, digging up why the character is doing what they are doing and are in the situation they are in.
In Theatre, we call this motivation.
Asking these questions should be like breathing.
If this questioning doesn't permeate into the rest of our life we are probably not going deep enough with our thinking and this may spill into our writing. Remember, practice makes perfect. No, perfect practice makes perfect, which is a perfect example of not looking deeper at the premise.