The optimist sees the rose and not his thrones; the pessimist looks at the thrones, ignoring the rose. There are two types of people in the world: optimists and pessimists. Optimistic people always see the positive side of things, even in tragic consequences, and live joyful lives. On the other hand, pessimistic people always see the dark side of things, even in happy conditions. The negative attitude of these people makes their lives tragic and full of tension. Economic depression, rapid social change, disillusionment and pessimism have become the dark social realities of the modern era. It was in the twentieth century that man's faith in the accepted values ​​and established institutions of life was broken, with the result that man found himself alone. The literature of the century in general and the theater in particular became a powerful expression of this feeling of nihilism. Eugene O'Neill took it up and expressed it beautifully in almost all of his expressionist pieces. Eugene Gladstone O'Neill, Nobel Prize winner for literature in 1936, is one of the few American playwrights of the 20th century to achieve worldwide stature and reputation. . It was O'Neill who, although deeply influenced by classical drama, pioneered modern American drama. He was an analyst of American society and the human situation. The cause of today's illness was the death of the old God and the inability to find a new one. The duty of the modern playwright was to dig into the roots of the ancient God. today's illness. Life without God has no meaning and the fear of death cannot be assuaged. In modern times, the term "behind life" relates to O'Neill's concept of destiny and suggests the existence of an external nature... middle of paper. In his acceptance of the Nobel Prize In his speech he said: I feel so deeply that it is not only my work that is being honored, but also that of all my American colleagues, that the Nobel Prize is a symbol of maturity of American theater (Goyal 39). QuotedClark, Barrett H. Eugene O'Neill: The Man and His Plays New York; Falk, Doris Virginia and Tragic Tension: An Interpretive Study of the Play New Brunswick, NJ: Rutegers University Press, 1958. Gassner, John O'Neill: A Collection of Critical Essays New Jersey: Prentice-Hall, Inc., 1964. Goyal, Bhagwat Swarup and his plays New Delhi: Arti Book Center. , 1970. Raleigh, John Henry. The Plays of Eugene O'Neill: Southern Illinois University Press, 1965. Sharma, The Dramatic Vision of NK O'Neill: Educational Publishers., 1985.