I found this sentence reading. But I didn't get the meaning. Could you explain it to me?

The sentence is: 

> 
> **It takes** a bigger man to walk away from a fight **than** it does to stay and fight
> 
> 
> 

It takes what? And it takes more or less? Because we have "than" so more than or less than ... I need an explanation because it seems like something is missing in this sentence. 
Thank you.