Then why did you say the experiences had something in common? Didn't this expression just compare the present case with those cases in which we primarily say that two experiences have something in common? (Thus we might say that some experiences of joy and of fear have the feeling of heart beat in common.) But when you said that the two experiences of strain had something in common, these were only different words for saying that they were similar: It was then no explanation to say that the similarity consisted in the occurrence of a common element.