Task: Categorize the tweet's emotional expression, classifying it as either 'neutral or no emotion' or as one or more of the specified emotions (anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust) that reflect the tweeter's state of mind.
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