"The amount of knowledge which we can justify from evidence directly available to us can never be large. The overwhelming proportion of our factual beliefs continue therefore to be held at second hand through trusting others, and in the great majority of cases our trust is placed in the authority of comparatively few people of widely acknowledged standing."

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Blacks were not enslaved because they were black but because they were available. Slavery has existed in the world for thousands of years. Whites enslaved other whites in Europe for centuries before the first black was brought to the Western hemisphere. Asians enslaved Europeans. Asians enslaved other Asians. Africans enslaved other Africans, and indeed even today in North Africa, blacks continue to enslave blacks.

— Thomas Sowell