Which rhetorical strategy is King using by repeating the phrase "I believe" in this passage?

The rhetorical strategy that he used was repetition and emphasis on the words he wanted to define. This led King get a hold of his audience's emotions, in order to convince them they want change in the curse of history, to have an equal standing of the people and that no color can separate them. He placed the emphasis on the words to engage them, with fluid speech patterns and biblical light.