Task: Determine the prevailing emotional tone of the tweet, categorizing 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 most accurately represent the tweeter's mental state.
Tweet: I've learned to let go of resentment for people who have hurt me, because keeping it is like swallowing poison and expecting them to die.
This tweet contains emotions: 
anger, optimism