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: @leighsteinberg April 25th, 2010 for me. Keep up the good work!! #sober #prouder
This tweet contains emotions: 
joy, optimism, trust