“I love man as my fellow; but his scepter, real, or usurped, extends not to me, unless the reason of an individual demands my homage; and even then the submission is to reason, and not to man.”

Markets, Governments, and the Common Good, speech at Hillsdale College (27 September 2007)
2000s
Context: Say that you hire me to mow your lawn and afterwards you pay me $30. What I have earned might be thought of as certificates of performance, i. e. proof that I served you. With these certificates of performance in hand, I visit my grocer and demand 3 pounds of steak and a six-pack of beer that my fellow man produced. In effect, the grocer asks, "Williams, you're demanding that your fellow man, as ranchers and brewers, serve you; what did you do in turn to serve your fellow man?" I say, "I mowed my fellow man’s lawn." The grocer says, "Prove it!" That's when I hand over my certificates of performance -- the $30.

Source: Life Is Worth Living

Pt. I
Under Western Eyes (1911)

Source: A Study in Scarlet

Section I, Chap. III.
The Theory of Moral Sentiments (1759), Part I

Attributed to Augustine by many sources on line, but without an actual reference.
Disputed

Source: Blood Promise

June 23
Meditations: Food For The Soul (1970)

Source: The Misanthrope