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: It is not joy that makes us #grateful . It is #gratitude that makes us #joyful .\n - David Rast
This tweet contains emotions: 
joy, optimism