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: A good head and a good heart are always a formidable combination.' - Nelson Mandela
This tweet contains emotions: 
optimism, trust