In the course of any discussion it is always important to remember or, if one does not know them, to try to find out the ultimate reasons that determine the particular viewpoints and different outlooks of the interlocutors. As a general rule those reasons do not come to the surface at the level on which the discussion takes place. This is not because they cannot be acknowledged—which might well be the case—but simply because it is seldom that anyone thinks of examining himself to discover the grounds upon which he bases his thought. By a sort of instinctive reaction, one is ‘for’ or ‘against’.