The Essence and the Relationship Between the Human Being and the Obvious

This book had as its theme the obvious precisely because we live in a society in which people do not even recognize the obvious. So what are you going to recognize? The obvious is the basis for the rest. As has been recalled several times in the book, obvious presupposes reason and common sense; if someone acts contrary to the obvious, it is because he is neither rational nor sensible. And is that important? What is the influence of acting rationally or not, sensibly or not?