If I converse with a person to whom I must show consideration while I am saying unpleasant things to him, it is almost more important that I should conceal the expression of my emotion from him, than that I modify the wording of my thoughts. If I speak to him in polite words, but accompany them by looks or gestures of hatred and disdain, the effect which I produce upon this person is not very different from what it would have been if I had recklessly thrown my contempt into his face.
