It is in fact the theme of the law. Professions and beliefs have nothing to do with justness. Justice is what you DO in regard to others, not what you claim to believe. Most people have never ever considered the relationship between child training and one's duty to his fellow man, but they are inseparable. Honesty, kindness, mercy, love, purity, all virtues are communicated by example only.
Wise fathers are just, and just fathers are a joy to their children.
The heart of a child is won by a father living justly. And if ye will receive it, this is Elias, which was for to come. He that hath ears to hear, let him hear. For John came neither eating nor drinking, and they say, He hath a devil. The Son of man came eating and drinking, and they say, Behold a man gluttonous, and a winebibber, a friend of publicans and sinners.