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What slavery really demonstrated was that we don't really know how to use energy wisely and that we can be incredibly abusive and barbaric.

Slavery is the first step towards civilization. In order to develop it is necessary that things should be much better for some and much worse for others, then those who are better off can develop at the expense of others.

You got to remember that slavery's very complex. It has a lot of levels to it.

Slavery, properly so called, is the establishment of a right which gives to one man such a power over another as renders him absolute master of his life and fortune.

Slavery was not a bad day on the job. It was not your boss yelling at you. It was not hard work for little pay. This was a full system of human subjugation.

Slavery is a weed that grows on every soil.

Wealth is a tool of freedom, but the pursuit of wealth is the way to slavery.

Slavery in West Africa, and in Rome and in the Mediterranean, was something different than slavery in America.

I can speak of slavery only so far as it came under my own observation - only so far as I have known and experienced it in my own person.

You cannot afford a world with slavery, which literally takes someone and turns them into a machine.