Quotes that relate to how everything effects everything?

I need a quote to write about for English class and we need to make text to world, self, or text connections and i want to connect my quote to a book i just read called 13 reasons why and in the book it talks a lot about how everything we do effects everything else in one way or another and we never know precisely how large that effect we have is. Also known as a theory called the butterfly effect http://en.wikipedia.org/wiki/Butterfly_effect. Are there any quotes that kind of embody this idea? Thx