People having speech defects sometimes learn part of the practice by laborious study, but good speech is always mainly unconscious speech. Any tennis player, even if he could not explain this enigma, could provide an analogy for it. When he sees a rapidly flying tennis ball coming toward him, he knows what he must do. He must maneuver himself into the proper position, be poised with his weight properly distributed, meet the ball with the proper sweep of his arm and with his racket held at just the right pitch, and all this must be timed to stop the flying ball at a precise point. But if the tennis player pauses to think of all these actions and how he will perform them, he is lost. The ball will not skim back over the net, building air pressure as it goes until it buzzes down into the opponent's corner. If the tennis player thinks about anything except where he wants the ball to go and what he plans for the next stroke, he will probably become so awkward that he will be lucky to hit the ball at all. Rapid, precise muscular actions can be successfully carried out only by the unconscious part of the brain. And so with the speaker. He cannot speak well unless he speaks unconsciously, for his movements are as precise, as complicated, and as exactly timed as those of the tennis player.