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: 'We can throw stones, complain about them, stumble on them, climb over them, or build with them.' — William Arthur Ward. #inspiring
This tweet contains emotions: 
joy, optimism