In the 60s, as a young director, he questioned Ingmar Bergman's status in Sweden and in the world with unusual fire and soul, believing the stories and camera work were to constructed and Bergmans characters too stiff. On the other hand, Bergman was very impressed with Widerberg's films, but the two directors never met.
Morals are highly important to me. In my novels, I was a terrible moralist, and even if I no longer want to judge, I'm still worried by sharp and unexpected differences of opinion.