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: The human race has one really effective weapon, and that is laughter. -- Mark Twain
This tweet contains emotions: 
joy, optimism