On a very rough-and-ready basis we might define an eccentric as a man who is a law unto himself, and a crank as one who, having determined what the law is, insists on laying it down to others. An eccentric puts ice cream on steak simply because he likes it; should a crank do so, he would endow the act with moral grandeur and straightaway denounce as sinners (or reactionaries) all who failed to follow suit. Cranks, at their most familiar, are a sort of peevish prophets, and it's not enough that they should be in the right; others must also be in the wrong.
Louis KronenbergerNominally a great age of scientific inquiry, ours has become an age of superstition about the infallibility of science; of almost mystical faith in its non-mystical methods; above all-which perhaps most explains the expert's sovereignty-of external verities; of traffic-cop morality and rabbit-test truth.
Louis KronenbergerConformity may not always reign in the prosperous bourgeois suburb, but it ultimately always governs.
Louis KronenbergerWe might define an eccentric as a man who is a law unto himself, and a crank as one who, having determined what the law is, insists on laying it down to others.
Louis Kronenberger