BOOK VII. Now that we have married our citizens and brought their children into the world, we have to find nurture and education for them. This is a matter of precept rather than of law, and cannot be precisely regulated by the legislator. For minute regulations are apt to be transgressed, and frequent transgressions impair the habit of obedience to the laws. I speak darkly, but I will also try to exhibit my wares in the light of day. Am I not right in saying that a good education tends to the improvement of body and mind? 'Certainly.' And the body is fairest which grows up straight and well-formed from the time of birth. 'Very true.' And we observe that the first shoot of every living thing is the greatest; many even contend that man is not at twenty-five twice the height that he was at five. 'True.' And growth without exercise of the limbs is the source of endless evils in the body. 'Yes.' The body should have the most exercise when growing most. 'What, the bodies of young infants?' Nay, the bodies of unborn infants. I should like to explain to you this singular kind of gymnastics. The Athenians are fond of cock-fighting, and the people who keep cocks carry them about in their hands or under their arms, and take long walks, to improve, not their own health, but the health of the birds. Here is a proof of the usefulness of motion, whether of rocking, swinging, riding, or tossing upon the wave; for all these kinds of motion greatly increase strength and the powers of digestion. Hence we infer that our women, when they are with child, should walk about and fashion the embryo; and the children, when born, should be carried by strong nurses,--there must be more than one of them,--and should not be suffered to walk until they are three years old. Shall we impose penalties for the neglect of these rules? The greatest penalty, that is, ridicule, and the difficulty of making the nurses do as we bid them, will be incurred by ourselves. 'Then why speak of such matters?' In the hope that heads of families may learn that the due regulation of them is the foundation of law and order in the state.