

“Never underestimate the power of stupid people in large groups.”
Source: Time Enough for Love (1973)
“Never underestimate the power of stupid people in large groups.”
“Never underestimate the power of human ingratitude.”
Source: Shadow Games (1989), Chapter 30, “Taglios Aroused” (p. 156)
“You can never underestimate the stupidity of the general public”
“Never underestimate the power of the mind to disempower.”
Step 5, p. 112
The Heart of Change, (2002)
“Never underestimate the power of a good story.”
Step 3, p. 80
The Heart of Change, (2002)
“Never underestimate the persuasive power of somehow.”
2010s
Context: Although no credible evidence exists that the speed of light can be exceeded, writers are willing to embrace the possibility that light might be outpaced somehow. Never underestimate the persuasive power of somehow.
"El mundo atribuye sus infortunios a las conspiraciones y maquinaciones de grandes malvados. Entiendo que se subestima la estupidez."
Breve diccionario del argentino exquisito, 1978.
“Never underestimate the power of funny, it moves mountains.”
Source: Fang
“Never underestimate your power to change yourself; never overestimate your power to change others.”