I read this story by Elbert Hubbard many years ago. It takes place in the Spanish-America War and I think in Cuba.
It was a motivational story reprinted many times after the first publication by Roycrafters in 1899.
The true first editions are worth several hundred dollars. Your copy will be worth considerably less as it was reprinted by another publisher many years later.
Book collectors normally are only interested in the first edition of a book ... even those printed 100+ years ago. There are just too many copies of later printings.
I would keep the book and pass it down to your children. Millions of people have read and made use of the advice it contains.