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: Only God knows why things happen, sometimes it's just hard to understand. #sad #prayingforyou
This tweet contains emotions: 
optimism, sadness