Therefore all argument is quite useless, for it only results in stiffening your friend's belief in his (presumably wrong) Theory.
When any one tries to argue with you, say, "You are nothing if not accurate, and you are not accurate." Then escape from the room.
When we hear our friends diligently expounding the ideas which Explain Everything, we are wistful. We go off and say to ourself, We really must dig up some kind of Theory about Life.
We read once of a great man that he never said, "Well, possibly so." This gave us an uneasy pang.
It is a mistake to be Open to Conviction on so many topics, because all one's friends try to convince one. This is very painful.