Task: Classify the mental state of the tweeter based on the tweet, determining if it is 'neutral or no emotion' or characterized by any of the provided emotions (anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust).
Tweet: #RIP30 Heaven is rejoicing because they've gained an angel, the Keifer family are in my prayers 💙🙏
This tweet contains emotions: 
joy, love, optimism, sadness