“The trouble with her is that she lacks the power of conversation but not the power of speech.”
Widely attributed to Shaw, this quotation is actually of unknown origin.
Misattributed
Variant: She had lost the art of conversation, but not, unfortunately, the power of speech.
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George Bernard Shaw 413
Irish playwright 1856–1950Related quotes

Source: No Logo: Taking Aim at the Brand Bullies 1999, Chapter Eight, "Corporate Censorship"

2010s, 2016, July, This Week Interview (July 30, 2016)

“Silence is most powerful. Speech is always less powerful than silence.”
Abide as the Self

Source: Understanding International Conflicts: An Introduction to Theory and History (6th ed., 2006), Chapter 3, Balance of Power and World War I, p. 61.

“Faith is a declaration of immunity to the powers of conversation.”
Sam Harris, "The View From The End Of The World" (9 December 2005)
2000s
Context: The problem with faith, is that it really is a conversation stopper. Faith is a declaration of immunity to the powers of conversation. It is a reason, why you do not have to give reasons, for what you believe.
“She had not yet decided whether to use her power for good… or for evil.”