"So time over time what will change the world, no one knows? The only promise is a day to live, to give and share with one another.
 See the wisdom from mistakes in our past; the promise of a new day."

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You are going to change the world, because that is actually what the world is. You do not pass through this life, it passes through you. You experience it, you interpret it, you act, and then it is different. That happens constantly. You are changing the world. You always have been.

— Joss Whedon