Is it o.k to be a quiter?

Something I learned is that it's not really o.k to be a quiter.Sometimes you just don't believe in yourself and quit.In the book,The Fighting Ground,Jonathan doesn't give up on the little boy. As well, he did give up on killing the Hessians.He thought he could of had done it, but then he quit. So i think SOMETIMES it is o.k to be a quiter,but never quit on your dreams or stop facing your fears.If you do then you'll always be a quiter!