... and associations which the other has not had and does not understand, because they are on an entirely different level. These create between them, with all the desire for understanding in the world, a barrier of misunderstanding and incomprehension, which is all the more fatal because it is so intangible, so obscure, so hard to put into words, so often actually unconscious or subconscious in the mind of one or of ... — Sex And Common-Sense • A. Maude Royden