Thinking Quotes - Page 218
"I, Asimov: A Memoir". Book by Isaac Asimov, p. 308, 1994.
Horace Mann (1867). “Thoughts”, p.212
George Clinton (2014). “Brothas Be, Yo Like George, Ain't That Funkin' Kinda Hard On You?: A Memoir”, p.363, Simon and Schuster
George Berkeley (1843). “Works, Including His Letters to Thomas Prior, Dean Gervais, Mr. Pope, &c. to which is Prefixed an Account of His Life”, p.187
"History teaches us that man learns nothing from history" by Georg Wilhelm Friedrich Hegel, § 31, 1807.