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: It could be soul-crushing despair, but it also might just be the marshmallows I had for breakfast
This tweet contains emotions: 
sadness