“People rarely change and if they do, they are not to be trusted.”
Help us to complete the source, original and additional information
Related quotes
Source: Economic Warfare Quotes

Why America must stop the war now (23 October 2001) http://www.theguardian.com/world/2001/oct/23/afghanistan.terrorism8.
Articles

“Change is rarely comfortable”
Autobiography http://nobelprize.org/nobel_prizes/physics/laureates/1978/penzias-autobio.html, Arno Penzias, The Nobel Prize in Physics 1978 (provided in 2004)

“Do not trust people. They are capable of greatness.”
More Unkempt Thoughts (1964)
“People rarely succeed unless they have fun in what they are doing.”
Dale Carnegie, quoted in Permission to Play : Taking Time to Renew Your Smile (2003) by Jill Murphy Long, p. 69

“It does not do to trust people too much.”
Source: The Yellow Wall-Paper

“Change happens at the speed of trust. (cf. The SPEED of Trust, 2008)”
First Things First (1994), Disputed