Task: Identify the primary emotion conveyed in the tweet and assign it to either 'neutral or no emotion' or one or more of the provided emotions (anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust) that best capture 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