For Man did not weave the web of life, he is mearly a strand in it. Whatever he does to the web, he does to himself. (Chief Seattle)
In all that has ever existed, in all that exists today, and in all that will ever exist, there will only ever be one YOU. You are unique and spectacular and can do anything you set your mind to. (wish I knew who wrote this)
We are made of star stuff you and I. The same elements that make up the stars are in us. This means we are stars, and as stars it is our duty to shine as brightly as we can. (OK, not the exact wording, but you get the idea.) From a Babylon 5 episode.