"Wherever he is not exceptionally learned he is quite casually ignorant."

Now against the specialist, against the man who studies only art or electricity, or the violin, or the thumbscrew or what not, there is only one really important argument, and that, for some reason or other, is never offered. People say that specialists are inhuman; but that is unjust. People say an expert is not a man; but that is unkind and untrue. The real difficulty about the specialist or expert is much more singular and fascinating. The trouble with the expert is never that he is not a man; it is always that wherever he is not an expert he is too much of an ordinary man. Wherever he is not exceptionally learned he is quite casually ignorant. This is the great fallacy in the case of what is called the impartiality of men of science. If scientific men had no idea beyond their scientific work it might be all very well- that is to say, all very well for everybody except them. But the truth is that, beyond their scientific ideas, they have not the absence of ideas but the presence of the most vulgar and sentimental ideas that happen to be common to their social clique...In short, the danger of the mere technical artist or expert is that of becoming a snob or average silly man in all things not affecting his peculiar topic of study; wherever he is not an extraordinary man he is a particularly stupid ordinary man...People talk about something pedantic in the knowledge of the expert; but what ruins mankind is the ignorance of the expert...In other words, the expert does not escape his age; he only lays himself open to the meanest and most obvious of the influences of his age. The specialist does not avoid having prejudices; he only succeeds in specialising in the most passing and illiterate prejudices.

-William Blake (1910)