His films probe the psychological and moral struggles of individuals confronting their authentic selves and existential responsibilities, particularly in works like *The Seventh Seal* and *Persona*.

He explores personal integrity through flawed characters forced to reconcile their desires with their principles, as seen in *There Will Be Blood* and *Boogie Nights*.

His humanistic films examine how individuals maintain moral dignity and truthfulness within complex family and social systems, exemplified by *Shoplifters* and *Broker*.