Custom has not been commonly regarded as a subject of any great moment. The inner workings of our own brains we feel to be uniquely worthy of investigation, but custom have a way of thinking, is behaviour at its most commonplace. As a matter of fact, it is the other way around. (1)_______________________. Yet that is a rather trivial aspect of the matter. The fact of first-rate importance is the predominant role that custom plays in experience and in belief, and the very great varieties it may manifest. No man ever looks at the world with pristine eyes. He sees it edited by a definite set of customs and institutions and ways of thinking. (2)_______________________. John Dewey has said in all seriousness that the part played by custom in shaping the behaviour of the individual as over against any way in which he can affect traditional custom, is as the proportion of the total vocabulary of his mother tongue over against those words of his own baby talk that are taken up into the vernacular of his family. When one seriously studies the social orders that have had the opportunity to develop autonomously, the figure becomes no more than an exact and matter-off-fact observation. (3)_______________________. From the moment of his birth the customs into which he is born shape his experience and behaviour. By the time he can talk, he is the little creature of his culture, and by the time he is grown and able to take part in its activities, its habits are his habits, its beliefs his beliefs, its impossibilities his impossibilities.