Dark and meaningful quotes?

What are some good dark and meaningful quotes? Quotes like: Nothing but a dream within a dream - Edgar Allan Poe or My dreams were blood, my hands were blades, and it was murder murder all over the place - Lucille Clifton It doesn't even have to be dark or eerie just as long as it's wise, deep,... show more What are some good dark and meaningful quotes?
Quotes like:

Nothing but a dream within a dream - Edgar Allan Poe

or

My dreams were blood, my hands were blades, and it was murder murder all over the place - Lucille Clifton

It doesn't even have to be dark or eerie just as long as it's wise, deep, and meaningful. I'm looking for a range/ variety of quotes that could apply to anyone or anything for stories I'm writing.
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