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: No pessimist ever discovered the secret of the stars,or sailed to an uncharted land,or opened a new doorway for the human spirit.-H.Keller
This tweet contains emotions: 
joy, optimism, pessimism