The persecution of Jews in occupied Poland meant that we could see horror emerging gradually in many ways. In 1939, they were forced to wear Jewish stars, and people were herded and shut up into ghettos. Then, in the years '41 and '42 there was plenty of public evidence of pure sadism. With people behaving like pigs, I felt the Jews were being destroyed. I had to help them. There was no choice.

Interview at Am Hauptbahn No. 4 in Frankfurt Am Main, West Germany (1964), quoted in The Oscar Schindler Story (2012).