Because the only thing anyone needs to be special is to believe that you can be.
7 seconds sound clip from the The Lego Movie (2014) movie soundboard.
You can hear this line at 01:11:26 in the Blu-ray version of the movie.
Quote context
[...]
- Didn't you hear him? The prophecy's made-up.
- I'm not The Special. And to think for a moment I thought I might be.
- Emmet.
- I did. I am Ghost Vitruvius. Woo!
- Emmet, you didn't let me finish earlier. Because I died.
- Because the only thing anyone needs to be special is to believe that you can be.
- I know that sounds like a cat poster, but it's true.
- Look at what you did when you believed you were special. You just need to believe it some more.
- But how can I just decide to believe that I'm special when I'm not?
- Because the world depends on it.
[...]