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: Very important thing for today: \n\nDo not #bully yourself with #100DaysOfCode \n\nBelieve me, It ruins fun!
This tweet contains emotions: 
sadness