In the first verse of this portion, the word "I," (ani) is repeated three times. "I am He, I am the first and I am even the last." The fact that this word is repeated three times means, "I am one and the same." Verse 15 begins with the word "I" repeated twice. Certainly if we meditate upon this in depth, "I, I" means two complementary manifestations of the same "I," as if the same person were speaking from two vantage points. If the first verse reads "I am He, I am the first and I am the last," it means that "I appear as the first, and I appear as the last, and I am He." There is no way, with simple common sense, to misunderstand this.