Task: Analyze the tweet's emotional connotations and classify it as either 'neutral or no emotion' or as one or more of the specified emotions (anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust) that best portray the tweeter's mental state.
Tweet: Difficulties, by bracing the mind to overcome them, assist cheerfulness, as exercise assists digestion.\nChristian Nestell Bovee #quotes
This tweet contains emotions: 
joy, optimism