“I learnt another valuable lesson that night: listen to the quiet voice inside. Intuition is the noise of the mind.”

Farewell Speech (2006)
Context: When you leave one home for another, there are always lessons to be learnt. And I had more to learn when I moved on from Minnesota to the United Nations - the indispensable common house of the entire human family, which has been my main home for the last 44 years.

On joining the Unitarian Universalist Association, in an interview with Reader's Digest (October 2004) http://www.adherents.com/people/pr/Christopher_Reeve.html
Context: It gives me a moral compass. I often refer to Abe Lincoln, who said, "When I do good, I feel good. When I do bad, I feel bad. And that is my religion." I think we all have a little voice inside us that will guide us. It may be God, I don't know. But I think that if we shut out all the noise and clutter from our lives and listen to that voice, it will tell us the right thing to do. The Unitarian believes that God is good, and believes that God believes that man is good. Inherently. The Unitarian God is not a God of vengeance. And that is something I can appreciate.

Source: Enemies of Promise (1938), Part 3: A Georgian Boyhood, Ch. 24: Vale (p. 259)

Although similar to many of Einstein's comments about the importance of intuition and imagination, no sources for this can be found prior to The Psychology of Consciousness by Robert Evan Ornstein (1973), p. 68 http://books.google.com/books?id=0Yh9AAAAMAAJ&q=%22really+valuable+thing+is+intuition%22#search_anchor, where there is no mention of where the quote was originally made. A number of early sources from the 1980s and 1990s attribute it to The Intuitive Edge by Philip Goldberg (1983), which also provides no original source.
Disputed

Source: Keeping the Moon

Variant: No, it's not a very good story - its author was too busy listening to other voices to listen as closely as he should have to the one coming from inside.
Source: Different Seasons

Source: The Time Keeper