Calvin: Man, Law, and the Civil Kingdom

"Since man is by nature a social animal, he is disposed, from natural instinct, to cherish and preserve society; and accordingly we see that the minds of all men have impressions of civil order and honesty. Hence it is that every individual understands how human societies must he regulated by laws, and also is able to comprehend the principles of those laws. Hence the universal agreement in regard to such subjects, both among nations and individuals, the seeds of them being implanted in the breasts of all without a teacher or lawgiver. The truth of this fact is not affected by the wars and dissensions which immediately arise, while some, such as thieves and robbers, would invert the rules of justice, loosen the bonds of law, and give free scope to their lust; and while others (a vice of most frequent occurrence) deem that to be unjust which is elsewhere regarded as just, and, on the contrary, hold that to be praiseworthy which is elsewhere forbidden. For such persons do not hate the laws from not knowing that they are good and sacred, but, inflamed with headlong passion, quarrel with what is clearly reasonable, and licentiously hate what their mind and understanding approve. Quarrels of this latter kind do not destroy the primary idea of justice. For while men dispute with each other as to particular enactments, their ideas of equity agree in substance. This, no doubt, proves the weakness of the human mind, which, even when it seems on the right path, halts and hesitates. Still, however, it is true, that some principle of civil order is impressed on all. And this is ample proof, that, in regard to the constitution of the present life, no man is devoid of the light of reason."

John Calvin. Institutes: Christian Religion, 1.2.13