Ambrose of Milan

We have here the message of the Scriptures which declares: "Children, love your fathers; parents, do not provoke your children to anger." Nature has implanted in beasts the instinct to love their own brood and hold dear their own progeny. But the beasts know nothing of relationsinlaw. Here, parents do not become estranged from their offspring by the act of changing their mates. They know nothing of preferences given to children of a later union to the neglect of those of a former marriage. They are conscious of the value of their pledges and are unacquainted with distinctions in respect to love, to incentives due to hate and to discriminations in acts that involve wrongdoing. Wild creatures have a nature that is simple and one which has no concern in the perversion of truth. And so the Lord has ordained that those creatures to whom he has bestowed a minimum of reason are endowed with the maximum of feeling.