Please analyze the tweet "Yesterday is history, tomorrow is amystery, and today is a gift; that's why they call it the present #livelife #humbleness  #live" and classify its emotional content. Choose from the following emotions: anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust. If no emotions are detected, respond with "neutral or no emotion".
joy, optimism