Training a child is exactly ...

Training a child is exactly like training a puppy; a little heedless inattention and it is out of hand immediately; the great thing is not to let it acquire bad habits that must afterward be broken.
 Emily Post

Quotes from the same author

Children are all more or less little monkeys in that they imitate everything they see. If their mother treats them exactly as she does her visitors they in turn play "visitor" to perfection. Nothing hurts the feelings of children more than not being allowed to behave like grown persons when they think they are able.
 Emily Post
Unconsciousness of self is not so much unselfishness as it is the mental ability to extinguish all thought of one's self - exactly as one turns out the light.
 Emily Post
If you are hurt, whether in mind or body, don't nurse your bruises. Get up, and light-heartedly, courageously, good-temperedly, get ready for the next encounter.
 Emily Post
To the old saying that man built the house but woman made of it a 'home' might be added the modern supplement that woman accepted cooking as a chore but man has made of it a recreation.
 Emily Post
To make a pleasant and friendly impression is not alone good manners, but equally good business.
 Emily Post