Those who have believing masters, let them not despise them, because they are brothers, but rather let them serve them, because those who partake of the benefit are believing and beloved. Teach and exhort these things.
because they are brethren: The converted bond servant should not have disdain or think less in his heart of his master in work and rank because he is a fellow Christian. That spiritual relationship--and the love inherent in it--should provoke the servant to be the more diligent in his labor.