In the world of dreams the rules of reality do not necessarily apply. Each dream is unique and it's a direct link to the soul and spirit. Psychology provides its own theories on what dreams mean, but so did tradition and the study of dreams for thousands of years before any relevant science had developed.
Dream Meanings - Devil
If you see the devil then expect bad news that will get you down. If the devil talks to you and you believe what he’s saying, then be careful as you will be betrayed by someone you trust.