Task: Determine the prevailing emotional tone of the tweet, categorizing 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 most accurately represent the tweeter's mental state.
Tweet: Let us not burden our remembrances with a heaviness that's gone.\n- William Shakespeare (1564-1616)\n#forge ahead.
This tweet contains emotions: 
optimism, sadness