But then his trousers were always rolled up at the knee, for the convenience of wading on the slightest notice; and his virtue, supposing it to exist, was undeniably "virtue in rags," which, on the authority even of bilious philosophers, who think all well-dressed merit overpaid, is notoriously likely to remain unrecognized (perhaps because it is seen so seldom).
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a bilious mood
One would think you were sick, or bilious, or something.