What is the greatest significance and/ or revelance of the Jourdon Anderson Letter?

The Jourdan Anderson letter is an eloquent description by
a former slave of the differences in his new life as a free man.  The letter is written
or dictated by Jourdan Anderson, a former slave of Colonel P.H. Anderson, regarding Col.
Anderson’s request for Jourdan to come back to Tennessee and work for him again. In his
reply, Anderson draws comparisons between his life as a free man and life as a slave. 
As a free man, he receives payment for his work, is treated well and his children are
allowed to go to school.  As a slave he earned no pay and compares himself and the other
slaves as receiving the same pay as the “horses and cattle”.