Identify and explain the central point expressed in the passage. What happens in him to render his desire for aggression innocuous?

Identify and explain the central point expressed in the passage.

What happens in him to render his desire for aggression innocuous? Something very remarkable, which we should never have guessed and which is nevertheless quite obvious. His aggressiveness is introjected, internalized; it is, in point of fact, sent back to where it came from—that is, it is directed towards his own ego.