“Why, that looks like that nice dull young man that tried to sell me a Bible yesterday,” Mrs. Hopewell said, squinting. “He must have been selling them to the Negroes back in there. He was so simple,” she said, “but I guess the world would be better off if we were all that simple.” Mrs. Freeman‖s gaze drove forward and just touched him before he disappeared under the hill. Then she returned her attention to the evilsmelling onion shoot she was lifting from the ground. “Some can‖t be that simple,” she said. “I know I never could.”
Mrs. Hopewell and Mrs. Freeman see Manley as a "simple" man, that he's not that bright since he's just a young man selling Bibles to anyone he can, that he can't do much else. But after the encounter with Hulga, the audience knows that he is indeed smarter than he looks as he said. Manley is a manipulator and uses religion to get what he wants by trying to pass as a "good country person."