What happens to other people if you say no to your dream

I just received two amazing books. It reminds me how years ago I was absolutely scared to say yes to my dream. We often sit on the edge of our dreams and ask what the cost is of saying yes to our dreams (salary, health, insurance, title, etc.) But what is the cost of saying no to your dream. By you saying no to your dream, you are keeping others from saying yes to their dream. Have you considered the Butterfly Effect?