The main philosophical malady of our time is an intellectual and moral relativism, the latter being at least in part based upon the former. By relativism-or, if you like, scepticism-I mean here, briefly, the theory that the choice between competing theories is arbitrary; since either, there is no such thing as objective truth; or, if there is, no such thing as a theory which is true or at any rate (though perhaps not true) nearer to the truth than another theory; or, if there are two or more theories, no ways or means of deciding whether one of them is better than another.