What is the purpose of the scene in Leo Tolstoy's The Death of Ivan Ilyich in which Ivan Ilyich thinks about the following logical argument, known as a syllogism?

The purpose of the scene in Leo Tolstoy’s The Death of Ivan Ilyich in which Ivan Ilyich thinks about the following logical argument, known as a syllogism is to show that to show that all men are mortal and therefore Ivan Ilyich, a man, must die.