Task: Determine the prevailing emotional tone of the tweet, categorizing 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 most accurately represent the tweeter's mental state.
Tweet: Bill Clinton: 'Do not grow weary of doing good.' @ClintonGlobal #CGI2016
This tweet contains emotions: 
joy, optimism