I will use the severest language I can command, and yet not one word shall escape me that any man, whose judgment is not blinded by prejudice, or who is not at heart a slave-holder, shall not confess to be right and just. -- Douglass continues to build his credibility with the audience. While he will certainly make inflammatory remarks, he vows to speak only truth. In fact, he argues that only a listener with extreme bias (one who is prejudiced or a "slave-holder at heart") could refute the justice of his claims.