Albert Einstein’s purpose is to explain whether or not god really exists in a simple way. His audience is a twelve year old girl. How ethos is applied is that the girl chooses to write to him because supposedly he is one of the most intelligent individual’s in the world. The thing about this letter is that he contradicts himself several times in answering the letter. He also loses the purpose of the letter when he begins using lengthier words, which most like a pre-teen wouldn’t understand. He begins to also base more on his opinion than actual facts.