Robert L. Flood (1990) Liberating Systems Theory p. 204; as cited in: Trudi Cooper (2003) Critical Management, Critical Systems Theory And System Dynamics http://www.mngt.waikato.ac.nz/ejrot/cmsconference/2003/proceedings/orsystems/Cooper.pdf.
“I know it's tedious, but you aren't SL4 until you appreciate the depth of human irrationality. Yes rationality is there, but at a level that just barely shows up when measured with precise instruments. This is important with respect to non-human intelligences, because super-rationality, almost as much as superintelligence, is potentially overwhelming and because intelligence bootstraping moves a system towards rationality. Appreciate how far humans are from rational and you appreciate how utterly transformed, and essentially recreated, they would be by haphazard bootstrapping. Appreciate how formidable rationality is and you see why a highly rational infrahuman GAI would still be a massive existential threat.”
"Another reminder of irrationality" http://sl4.org/archive/0602/14276.html, February 2006
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Michael Vassar 4
President of the Singularity Institute 1979Related quotes

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

SGU Podcast #254, May 26th, 2010 http://www.theskepticsguide.org/podcast/sgu/254
The Skeptics' Guide to the Universe, Podcast, 2010s
Source: A Funeral for the Eyes of Fire (1975), Chapter 14, “Denouement: Ascent to the Acropolis” (p. 266)

“The point is that humans are rarely at their best when they use rational reasoning.”
Source: Why Stock Markets Crash - Critical Events in Complex Systems (2003), Chapter 4, Positive Feedbacks, p. 106.

“Rationality is not one of humanity’s strong points.”
Source: The Ghost Brigades (2006), Chapter 5 (p. 88)