I have no idea. Where did you come across this expression?
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It is obviously from Sherlock Holmes PartI :
ADVENTURE 1: “A SCANDAL IN BOHEMIA”"... All emotions, and that one particularly, were abhorrent to his cold, precise but admirably balanced mind. He was, I take it, the most perfect reasoning and observing machine that the world has seen, but as a lover he would have placed himself in a false position. He never spoke of the softer passio