Task: Categorize the tweet's emotional tone as either 'neutral or no emotion' or identify the presence of one or more of the given 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