10 But God has provided many other instructors for us besides conscience; viz., fathers for children, masters for servants, husbands for wives, teachers for pupils, law-givers and judges for those who are to be governed, and friends for friends. And frequently too we gain no less from enemies than friends; for when the former reproach us with our offenses, they stir us up, even against our will, to the amendment of them. So many teachers has He set over us, in order that the discovery of what is profitable, and the regulation of our conduct, might be easy to us, the multitude of those things which urge us on toward it not permitting us to fall away from what is expedient for us. For although we should despise parents, yet while we fear magistrates, we shall in any case be more submissive than otherwise. And though we may set them at nought when we sin, we can never escape the rebuke of conscience: and if we dishonour and repel this, yet while fearing the opinion of the many, we shall be the better for it. And though we are destitute of shame with regard to this, the fear of the laws will press on us so as to restrain us, however reluctantly.
Source: Homilies on the Statues (New Advent)