When someone has asked, "Please tell me, what do you think of it?" then the opinion becomes the answer to a demand. Sometimes the opinion is nothing but the voice of pride, and sometimes one's opinion is colored by one's favor or disfavor. Sometimes opinion lacks knowledge of the object on which it is formed. The wise therefore asks himself the question whether he has thorough knowledge on the subject upon which he expresses his opinion. If one took into consideration that very often one does not know what effect the expression of opinion may produce in the mind of the hearer, what reaction it will have, desirable or undesirable, one would certainly think much before expressing an opinion.