Task: Assess the emotional content of the tweet and classify it as either 'neutral or no emotion' or as one or more of the given emotions (anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust) that best represent the tweeter's mental state.
Tweet: we never taste happiness in perfection, our most fortunate successes are mixed with sadness. #success  #perfection #fortunate #mixed
This tweet contains emotions: 
joy, optimism, sadness