Dorothy L. Sayers,
Whose Body? — Chapter XI
(1923)
“ You know quite well that the strain you put on your nerves during the war has left its mark on you. It has left what I may call old wounds in your brain. Sensations received by your nerve-endings sent messages to your brain, and produced minute physical changes there—changes we are only beginning to be able to detect, even with our most delicate instruments. These changes in their turn set up sensations; or I should say, more accurately, that sensations are the names we give to these changes of tissue when we perceive them: we call them horror, fear, sense of responsibility and so on. ”
