The most effective rhetorical device, I think, used by Martin Luther King is, ethos and pathos because he used the colored people's belief to get them to support him in his journey and he used their emotions to compare it to the whiteś emotion.First, Martin uses ethos,¨Like paul, i must constantly respond to the macedonian call for aid.¨ (SB Page 207) This means, in martinś speech he wisely used the belief of his people (God) to inspirate them. This is a clear example of ethos. Next Martin uses Pathos ¨We know through painful experience that freedom is never voluntarily given by the oppressor.” (SB Page 207) This is where, in one of martin luther king speeches, he used pathos to motivate his listeners. He uses their emotion to gain their support.