It is not the conscience which raises a blush, for a man may sincerely regret some slight fault committed in solitude, or he may suffer the deepest remorse for an undetected crime, but he will not blush. It is not the sense of guilt, but the thought that others think or know us to be guilty which crimsons the face.[“I blush,”says Dr. Burgess, “in the presence of my accusers.”]

Source:Chapter XIII. Self-attention - Shame - Shyness - Modesty: Blushing
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