What Ingmar Bergman is saying is this: Art is both form and content, but out of the two, content is what's ultimately of importance. If you have something meaningful to say, you can communicate that via art, despite that you're tweaking the guitar too much, that the drumer dropped the pace in one passage, or that the singer had to improvise the last part of a song. It works, because we're immersed by a meaningful, emotional experience and it speaks to us.

But you could also perfect and style art until it becomes a slick product (Britney Spears, or 99,8 % of all Hollywood movies), and you will still have form only and no serious content. It's like hipsters who dress out in fancy clothes and adopt politically correct stances to appear important, but once we inspect what's behind the form, we see morally corrupt and emotionally broken people who lack direction in life.

Ingmar Bergman was a rare genius who managed to refine and perfect both form and content, and for those who are open to understand his legacy that reflects the human nature in its very essence, his art will continue to demonstrate the value of this insight for generations to come.