Here's a simple method: After spending some time with someone, look in the mirror from time to time. If you find yourself becoming more attractive, smiling more, more confident, radiant, and with improved skin and mental state, then this person is at least having a positive influence on you at this stage. Conversely, if you find yourself becoming timid, tired, anxious, insecure, and with a dull complexion, then cut your losses as soon as possible. This method is useful for many relationships, such as testing whether you've chosen the right leader, the right boyfriend/girlfriend… A person who brings you good fortune will make you more beautiful [666].