"The difference between a good performance and a powerful performance is that a good performance requires the actor to know the 'moment'. This creates a distance from the characters' emotional life and only grasps the intellectual idea of their inner struggle. It's not a bad thing. It just sells the actor short, and thus the audience, of a truly holistic experience of the character. Whereas a powerful performance requires the actor to be in the moment - all in, accessing their entire being not just their mind but their body and heart too. That's dedication to the craft. That's when audience and actor meld and something mystical happens to both"