"[E]ven though Poland had made a major contribution to the victory which put an end to the Second World War, in June 1945 a representative of our country was not allowed to put his signature to the United Nations Charter. We remember that event when Artur Rubinstein, seeing that there was no Polish delegation at the concert to mark the signing of the Charter, decided to play the "Dąbrowski Mazurka", Poland's national anthem, to demonstrate that "Poland was not lost yet", that Poland lived on. I am recalling this because I had a very touching moment a few days ago in the same San Francisco opera house, to which I was invited for the opening of the season. This time it was the orchestra that played the "Dąbrowski Mazurka", and at that moment the memories of the great Artur Rubinstein and his performance came back with full force and it was very touching indeed for me."
January 1, 1970
https://en.wikiquote.org/wiki/Poland_Is_Not_Yet_Lost