Task: Evaluate the tweet for emotional cues and classify 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 indicate the tweeter's state of mind.
Tweet: Sometimes it takes #sadness to know happiness, #noise to appreciate #silence and absence to value presence.
This tweet contains emotions: 
anticipation, joy, optimism, sadness