The source from which this knowledge comes is not reason. People who are very good at reasoning can go on fighting all their lives, and yet nothing may come of it. Ultimately their reasoning turns into a play on words and terms; and as a word can be made to mean anything, they have always an easy way of escape from being caught by the person with whom they argue. It is just like wrestling; or just as in a court of law two barristers will each present their case as being the truth even though they may in fact know that it is not true. They fight with their reason and logic.