How it Begins and Ends

I bet It begins with a dream
For those who leave a mark
And for those who speak 
from the heart
For those who find a breakthrough 
Or create something really new
For the masters of the Arts
And for those who send
a rover to Mars
For those who are ready to fight
For what they believe to be right
For those who make the ultimate
Sacrifice leaving family and friends
I bet they are the only ones
Who know how it ends