“Innocence lost is not easily regained. The designer simply cannot predict the problems people will have, the misinterpretations that will arise, and the errors that will get made.”

"The Solution" ["Die Lösung"] (c. 1953), as translated in Brecht on Brecht : An Improvisation (1967) by George Tabori, p. 17
Variant translation:
The Secretary of the Writers Union
Had flyers distributed in Stalin Way that said
That the People had frivolously
Thrown away the Government's Confidence
And that they could only regain it
Through Redoubled Work. But wouldn't it be
Simpler if the Government
Simply dissolved the People
And elected another?

Thee Reversal of Fate

Source: Think Big: Unleashing Your Potential for Excellence

The Following Story (1991)

As quoted in "Nuclear weapons unholy, Iran says" in SFGate (31 October 2003) http://www.sfgate.com/cgi-bin/article.cgi?file=/c/a/2003/10/31/MNGHJ2NFRE1.DTL.
2003

Source: 1960s, Scientific method: optimizing applied research decisions, 1962, p. 340 as cited in: Philosophica gandensia, Vol.6-7 (1968). p. 141.

Introduction to the 2002 Edition, p. ix.
The Design of Everyday Things (1988, 2002)

Knowing Yourself: The True in the False (1996)