What makes you different is the exact thing that makes you irreplaceable.

From the beginning, man could look up at a vast universe dotted by innumerable stars to find every evidence that he was nothing. This evidence only grows stronger as science and technology record an expanse of galaxies filled with planetary solar systems beyond any visible end. Man is but a grain of sand lost on an endless seashore, and yet he believes with conviction in his own greatness.  He is either a divine soul intuitively aware of his inherent, limitless potential—or he is a blind fool.

Some people might leave you,' he said, for once ignoring a joke in favor of something real. 'But it doesn't mean you're worth leaving. It doesn't mean that at all.

You are worth infinitely more than you could possibly imagine.