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: Be happy not because everything is good, but because you can see the good side of everything. #optimism
This tweet contains emotions: 
joy, optimism