Don't fear change. It's always for the best.
Civilization... wrecks the planet from seafloor to stratosphere.
Your conscience is the measure of the honesty of your selfishness. Listen to it carefully.
Argue for your limitations, and sure enough they're yours.
Grief is no more necessary when we understand death than fear is necessary when we understand flying.
The only thing that matters, at the end of a stay on earth, is how well did we love, what was the quality of our love?