"Margot has all this in addition to a unique audacity that surprises and challenges and just burns like a brand into every character she plays," he gushes.
And the ballsy move Robbie pulled to secure her role in Wolf of Wall Street:
"She clinched her part during our first meeting - by hauling off and giving Leonardo DiCaprio a thunderclap of a slap on the face, an improvisation that stunned us all."
That's right - Margot Robbie, then a Hollywood unknown barely out of her teens, straight-up slapped one of the most powerful actors in the business across the face.
Hey, it worked. Four years after the film's release, 74-year-old Scorsese still sounds utterly besotted by her.
"Margot is stunning in all she is and all she does, and she will astonish us forever," he writes.