Gunpowder played a very beneficial role for the Europeans and a very detrimental role for the natives when it came to conquest, since almost all the natives in the newly-discovered lands could only fight back with man-made weapons such as spears. <span />
He would sometimes use a translated version of the bible, in this case, he did. This speech is an allusion to his bible, and he means that slave owners get labor produced yet it is not from their own work. Thus it was from the sweat of other men that that they obtained there "bread". There bread symbolizes all of their wealth.