Regret, Nostalgia, Wisdom, Thoughts, …., Memories.

Calvin and Hobbes
Random Top 10 (no particular order)

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    1. Memories
    2. Change
    3. Enjoy the Moment
    4. Ignorance is Bliss
    5. I can do all things
    6. Infinity
    7. Action
    8. Happiness
    9. Life
    10. Death and Mysteries