Now, Lincoln said to Douglas, if you accept that Taney’s opinion that slavery is expressly affirmed in the Constitution is true, then you are under a… - Harry V. Jaffa

According to Abraham Lincoln, public opinion always has a central idea from which all its minor thoughts radiate. The central idea of the American Founding—and indeed of constitutional government and the rule of law—was the equality of mankind. This thought is central to all of Lincoln's speeches and writings, from 1854 until his election as president in 1860. It is immortalized in the Gettysburg Address.

Slavery in the British colonies of North America was more than a century-and-a-half old before independence. It was roundly condemned, at one time or another, by nearly all the important political personages of the Revolution. I know of no instance in which any of these personages contradicted the doctrine of the Declaration, or maintained that slavery was a positive good. We must recognize, however, that slavery next to the family was perhaps the oldest institution of civilized mankind. Its origin in the ancient world came with the discovery that it was more profitable to enslave an enemy defeated in war than to kill him. The ancient law of the ancient city may be seen in the Bible. When the Israelites conquered Jericho, they put to the sword everyone in the city—men and women, young and old, sheep, oxen, and asses. Only Rahab the harlot and her family were spared, since they had given shelter to the Israelite spies. Later, in the custom of ancient warfare, the males of a defeated people would all be killed, but the women and children would be carried into slavery. Eventually the entire population of a defeated people would be enslaved. Such are the steps in the human story. That defeat in war meant slavery was the rule for many thousands of years.

Relativism, positivism, and nihilism — modern doctrines which mock wisdom and scorn virtue — have at the dawn of the twenty-first century come to dominate.