“About ten thousand years ago there were at least four major populations in West Eurasia — the farmers of the Fertile Crescent, the farmers of Iran, the hunter-gatherers of central and western Europe, and the hunter-gatherers of eastern Europe. All these populations differed from one another as much as Europeans differ from East Asians today. Scholars interested in trying to create ancestry-based racial classifications, had they lived ten thousand years ago, would have categorized these groups as "races," even though none of these groups survives in unmixed form today.”

— David Reich (geneticist), book Who We Are and How We Got Here

David Reich, Who We Are and How We Got Here: Ancient DNA and the New Science of the Human Past, Knopf Doubleday Publishing Group, 2018, p.146

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David Reich (geneticist)6

American geneticist, Professor of Genetics 1974

David Reich (geneticist) (1974) American geneticist, Professor of Genetics

How Genetics Is Changing Our Understanding of ‘Race’ https://www.nytimes.com/2018/03/23/opinion/sunday/genetics-race.html, NY Times, 23 March, 2018

“People often think that Europeans are homogeneous group that arrived in a simple way there maybe 40 or 50 thousand years ago maybe based on the archaeology and just kind of sat there until they became the Europeans they are today, but that's probably not true: the Europeans today are a replacement population who came in much more recently and replaced the people who were there originally 40 thousand years ago.”

David Reich (geneticist) (1974) American geneticist, Professor of Genetics

History Aids Understanding Diseases Today http://www.livescience.com/21740-history-aids-understanding-diseases-today.html, National Science Foundation, 20 July 2012

“The best estimates are that it takes a minimum of fifty thousand years for an adaptation to show up in the human genome. This is called evolutionary lag… Our hunter-gatherer ancestors had a very different lifestyle…”

Daniel Levitin (1957) American psychologist

This is Your Brain on Music (2006)

“The population of the earth today doubles regularly. If you were to draw up the population growth on a chart you would see that it goes back to zero about five thousand years ago. If man has been here millions of years like evolutionists teach, where is the population?”

Kent Hovind (1953) American young Earth creationist

Dissertation for doctor of philosophy in christian education (May 25, 1991)

“Do not think of knocking out another person's brains because he differs in opinion from you. It would be as rational to knock yourself on the head because you differ from yourself ten years ago.”

Horace Mann (1796–1859) American politician

James Burgh, in The Dignity of Human Nature, Or, A Brief Account of the Certain and Established Means for Attaining the True End of Our Existence (1754); this is very widely misattributed to Mann, appearing at least as early as the publication of Thoughts Selected from the Writings of Horace Mann (1867) edited by Mary Mann.
Misattributed

James Burgh (1714–1775) British politician

Variant in other editions: Do not think of knocking out another person's brains, because he differs in opinion from you; it will be as rational to knock yourself on the head because you differ from what you thought ten years ago.
The Dignity of Human Nature (1754)