self-propulsion

Never talk to waiters like that," Kit said."Can I help it," he said, "if I only went one year to finishing school?""It isn't manners," she said like a sensible schoolteacher quietly disciplining a small boy, "it just isn't smart."I thought of the time I first told him not to say ain't. He took this the same way, a little peeved but making mental notes. I noticed he was never too much of an egotist to take criticism when he knew it would help. It was part of his genius for self-propulsion. I was beginning to see what Kit had for Sammy. Of course she stood for something never within his reach before. But it was more than that. Sammy seemed to know that his career was entering a new cycle where polish paid off. You could almost see him filing off the rough edges against the sharp blade of her mind.