In this quote, Ridley Scott is highlighting the significance of casting in filmmaking. He is recommending that the stars chosen for a movie can make or break its success. The right cast can bring a story to life and make it credible, while the wrong cast can mess up the whole production. Scott, being a prominent director himself, comprehends the vital role that actors play in the success of a movie. He is advising us that no matter how excellent the script or the visuals might be, it is ultimately the stars who bring the characters to life and make the story resonate with the audience.