When one questions, one challenges one's beliefs. When one challenges their beliefs, they are forced to reckon those beliefs with other information.; They then can make a judgment, updating their understanding based on the additional information they have now gained. When reading a paper, book, news article, or anything really, one must always be questioning what they are reading, reconciling it with outside information and experience, so that they can use the information to gain a more accurate understanding of the subject. Or, it allows one to be able to tell when something is wholly in its essence incorrect, whereas complacency in reading can lead the reader to unconsciously accept as true what they would never have had they constantly questioned.
Not sure if this is what you're after, but I hope it helps!