"Afternoon classes - that evil invention!"

John Gresham Machen's quote reveals his ridicule for afternoon classes. He likely thinks that afternoon classes are an unnecessary and unwanted addition to the school day. He may feel that afternoon classes are an evil innovation due to the fact that they hinder students' leisure time and ability to pursue other activities. He might likewise feel that afternoon classes are a wild-goose chase, as students are typically tired and less efficient in the afternoon. Furthermore, he might feel that afternoon classes are a concern on instructors, who need to stay at school longer and teach more classes. Ultimately, Machen's quote expresses his unfavorable opinion of afternoon classes and his belief that they are an unwelcome addition to the school day.