Thinking Quotes - Page 828
Maya Angelou (2008). “Letter to My Daughter”, p.5, Random House
One must think like a hero to behave like a merely decent human being.
May Sarton (2014). “Journal of a Solitude”, p.72, Open Road Media
"Productive thinking". Book by Max Wertheimer, p. 190, 1945.
Max Stirner, David Leopold (1995). “Stirner: The Ego and Its Own”, p.283, Cambridge University Press
"Eclipse of Reason" by Max Horkheimer, (pp. 7-8), 1947.