Task: Assess the emotional content of the tweet and classify it as either 'neutral or no emotion' or as one or more of the given emotions (anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust) that best represent the tweeter's mental state.
Tweet: Even death is unreliable. Instead of zero it may be some ghastly hallucination, such as the square root of minus one.  Samuel Beckett
This tweet contains emotions: 
disgust, fear, pessimism, sadness