The Longest Journey by E.M. Forster

The sense of purity is a puzzling and at times a fearful thing. It seems so noble, and it starts as one with morality. But it is a dangerous guide, and can lead us away not only from what is gracious, but also from what is good. Agnes, in this tangle, had followed it blindly, partly because she was a woman, and it meant more to her than it can ever mean to a man; partly because, though dangerous, it is also obvious, and makes no demand upon the intellect. She could not feel that Stephen had full human rights. He was illicit, abnormal, worse than a man diseased. And Rickie remembering whose son he was, gradually adopted her opinion. He, too, came to be glad that his brother had passed from him untried, that the symbolic moment had been rejected. Stephen was the fruit of sin; therefore he was sinful, He, too, became a sexual snob.

And now he must hear the unsavoury details. That evening they sat in the walled garden. Agues, according to arrangement, left him alone with his aunt. He asked her, and was not answered.