“How much education may reconcile young people to pain and sufference, the examples of Sparta do sufficiently shew; and they who have once brought themselves not to think bodily pain the greatest of evils, or that which they ought to stand most in fear of, have made no small advance toward virtue.”
Sec. 115
Some Thoughts Concerning Education (1693)
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John Locke 144
English philosopher and physician 1632–1704Related quotes

Misattributed
Source: Robert McAfee Brown https://en.wikipedia.org/wiki/Robert_McAfee_Brown. Preface for the 25th anniversary edition of Night https://en.wikipedia.org/wiki/Night_%28book%29. Page v, Bantam Books paperback; 1982 reissue edition.

The Philosophy of Paine (1925)
Context: I consider Paine our greatest political thinker. As we have not advanced, and perhaps never shall advance, beyond the Declaration and Constitution, so Paine has had no successors who extended his principles. Although the present generation knows little of Paine's writings, and although he has almost no influence upon contemporary thought, Americans of the future will justly appraise his work. I am certain of it.
Truth is governed by natural laws and cannot be denied. Paine spoke truth with a peculiarly clear and forceful ring. Therefore time must balance the scales.
"Life After Lebanon" (1984), later published in On Call : Political Essays (1985), and Some of Us Did Not Die : New and Selected Essays of June Jordan (2002)
Source: Against a Scientific Justification of Animal Experiments, pp. 345-346

"Does God Exist?" debate vs Stephen Law, Westminster Central Hall, London, , quoted in * 2012-10-04
William Lane Craig argues that animals can’t feel pain
Jerry
Coyne
Jerry Coyne
Why Evolution Is True
http://whyevolutionistrue.wordpress.com/2012/10/04/william-lane-craig-argues-that-animals-cant-feel-pain/
2013-03-07
"Re: The NAACP is Insane!" (21 February 2008) http://www.youtube.com/watch?v=d6FX8IMw-uM