“Don’t passively accept contagions. Turn your mind into an immune system that intercepts invading ideas, assesses them, and destroys the bad ones.”
Help us to complete the source, original and additional information
Guy P. Harrison 21
American skeptic author 1963Related quotes

The Ballot or the Bullet (1964), Speech in Detroit, Michigan (12 April 1964)
Context: Historically, revolutions are bloody. Oh, yes, they are. They haven’t never had a bloodless revolution, or a nonviolent revolution. That don’t happen even in Hollywood. You don’t have a revolution in which you love your enemy, and you don’t have a revolution in which you are begging the system of exploitation to integrate you into it. Revolutions overturn systems. Revolutions destroy systems.
“The systems approach is not a bad idea”
Source: 1960s - 1970s, The Systems Approach (1968), p. 232
Source: The Poker Face of Wall Street (2006), Chapter 4, A Brief History of Risk Denial, p. 75

“Your mind is for having ideas, not for holding them.”
13 November 2009 https://twitter.com/gtdguy/status/5673602109
Official Twitter profile (@gtdguy) https://twitter.com/gtdguy