The Question and Answer section for Mythology is a great resource to ask questions, find answers, and discuss the novel.
I read this story so long ago but I think Lucius is turned into a donkey by magic gone wrong. After many trials and tribulations, Lucius gets his human form back by eating sacred roses from the goddess Isis.
I don't know exactly what your teacher means. It sounds like a mythological answer must be connected to a question but I'm not sure what your teacher is implying. Is it perhaps a universal question about life?
I think I just answered this.