Task: Categorize the tweet's emotional tone as either 'neutral or no emotion' or identify the presence of one or more of the given emotions (anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust).
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