Regularity is desirable in the building up of the personality of a child. It is habit which forms nature, but nature has no habit. It is always beneficial for a child to eat when hungry, to rest when tired. In this way the child makes its own nature instead of becoming subject to habits. Pure and nourishing food is necessary for a child while it grows. It needs all kinds of food to nourish its growth; also a child must have good long hours of sleep according to the needs of each child. At the same time a certain part of the day must be kept for the child to rest, and it must be done in such a manner that the child, whose natural tendency is to be active, may gladly take this rest. This can be done by telling it a story or giving it some work of art to look at, or by letting the child hear some music.