" And for Miss Crane there was something else besides, a feeling she had often had before, a feeling in the bones of her shoulders and the base of her skull that she was about to go over the hump thirty-five years of effort and willingness had never got her over; the hump, however high or low it was, which, however hard you tried, still lay in the path of thoughts you sent flowing out to a man or woman whose skin was a different color from your own. Were it only the size of a pebble, the hump was always there, disrupting the purity of that flow, the purity of the thoughts. "

― Paul Scott , The Jewel in the Crown