Task: Assess the emotional content of the tweet and classify it as either 'neutral or no emotion' or as one or more of the given emotions (anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust) that best represent the tweeter's mental state.
Tweet: If you want others to be #happy, practice #compassion. If you want to be happy, practice compassion.' Dalai Lama
This tweet contains emotions: 
joy, love, optimism