“The things… which are proper to the understanding no other man is used to impede”
VIII, 41
Meditations (c. 121–180 AD), Book VIII
Context: The things... which are proper to the understanding no other man is used to impede, for neither fire, nor iron, nor tyrant, nor abuse, touches it in any way. When it has been made a sphere, it continues a sphere.
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Marcus Aurelius 400
Emperor of Ancient Rome 121–180Related quotes

“Subjugation is something which is an impedance on the ascent of man.”
In an interview with Ms. Barkha Dutt #Townhall with Kamal Haasan, about atheism and rationalism.

“Let us be wise, and not impede the soul.”
Woman in the Nineteenth Century (1845)
Context: What I mean by the Muse is that unimpeded clearness of the intuitive powers, which a perfectly truthful adherence to every admonition of the higher instincts would bring to a finely organized human being. It may appear as prophecy or as poesy. … and should these faculties have free play, I believe they will open new, deeper and purer sources of joyous inspiration than have as yet refreshed the earth.
Let us be wise, and not impede the soul. Let her work as she will. Let us have one creative energy, one incessant revelation. Let it take what form it will, and let us not bind it by the past to man or woman, black or white.

The Drowned and the Saved (1986)
Context: In countries and epochs in which communication is impeded, soon all other liberties wither; discussion dies by inanition, ignorance of the opinion of others becomes rampant, imposed opinions triumph. The well-known example of this is the crazy genetics preached in the USSR by Lysenko, which in the absence of discussion (his opponents were exiled to Siberia) compromised the harvests for twenty years. Intolerance is inclined to censor, and censorship promotes ignorance of the arguments of others and thus intolerance itself: a rigid, vicious circle that is hard to break.

“Young man, in mathematics you don't understand things. You just get used to them.”
Reply, according to Dr. Felix T. Smith of Stanford Research Institute, to a physicist friend who had said "I'm afraid I don't understand the method of characteristics," as quoted in The Dancing Wu Li Masters: An Overview of the New Physics (1979) by Gary Zukav, Bantam Books, p. 208, footnote.

Time in History: Views of Time from Prehistory to the Present Day (1988)
Context: The development of rational thought actually seems to have impeded man's appreciation for the significance of time.... Belief that the ultimate reality is timeless is deeply rooted in human thinking, and the origin of rational investigation of the world was the search for permanent factors that lie behind the ever-changing pattern of events.<!--p.22
Intellectual Freedom (1971)

This Business of Living (1935-1950)