Task: Classify the mental state of the tweeter based on the tweet, determining if it is 'neutral or no emotion' or characterized by any of the provided emotions (anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust).
Tweet: Defining yourself in terms of opposition, i.e. the clouded mirror phenomena, is almost always a mistake.
This tweet contains emotions: 
anger, anticipation, disgust, pessimism