The first quotation could be "And that is really what it was. I was going up in public opinion, but to the same extent life was ebbing away from me. And now it is all done and there is only death." due to the realistic description of death. Death is one of life's only promises and Tolstoy uses it frequently to depict how life goes on and changes based on view points and facts but death is the only thing experienced by everyone and a part of everyday life.
Another case of realism in the text is when Tolstoy writes; "Suddenly some force struck him in the chest and side, making it still harder to breathe, and he fell through the hole and there at the bottom was a light…Just then his schoolboy son had crept softly in and gone up to the bedside. The dying man was still screaming desperately and waving his arms. His hand fell on the boy's head, and the boy caught it, pressed it to his lips, and began to cry." This is a form of realism because its not a description of thoughts or meaning but it is just something that is and that happens. Its realistic because everyone loses someone important to them at one time or another yet some people do not know how horrible and traumatizing it can be. Tolstoy describes this in a dark and realistic way using this quotation.
