That statement, "the next one", is powerful. This is how professional speakers should view their business. Your favorite speech should be the next one. This mentality means that you're hungry to be successful. You can't wait to share your message with the next audience. This mentality propels you into a forward motion. There's no need to beat yourself up about a speech that went bad, and there's no reason to sit and reminisce about that perfect speech to the perfect audience because you're too busy thinking about your next speech to your next audience.
This "next one" mentality will speak volumes about your work ethic. Once you've enjoyed giving a great speech, you're right back to work (training, so to speak) for the next great speech. You will never be standing still waiting for the speech to come to you. You will consistently be on the top of your game.
So if you're a professional speaker, are you focused on "the next one"?