“There is an adult in every child and a child in every adult.”
Source: The Moral Judgment of the Child (1932), Ch. 1 : The Rules of the Game, § 8 : Conclusions : Motor Rules and the Two Kinds of Respect <!-- p. 85 -->
Context: In certain circumstances where he experiments in new types of conduct by cooperating with his equals, the child is already an adult. There is an adult in every child and a child in every adult. … There exist in the child certain attitudes and beliefs which intellectual development will more and more tend to eliminate: there are others which will acquire more and more importance. The later are not derived from the former but are partly antagonistic to them.
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Jean Piaget 66
Swiss psychologist, biologist, logician, philosopher & acad… 1896–1980Related quotes
"Books of the Times" http://query.nytimes.com/gst/fullpage.html?res=9506EFD61038F930A1575AC0A964948260&scp=62&sq=&st=nyt, The New York Times (23 September 1982)

leadersmag.com http://www.leadersmag.com/issues/2012.3_Jul/Women%20Leaders/LEADERS-Irina-Bokova-UNESCO.html.

“What is an adult? A child blown up by age.”
A Woman Destroyed [Une femme rompue] (1967)
General sources

“Are you the adult that you want your child to grow up to be?”
Source: Daring Greatly: How the Courage to Be Vulnerable Transforms the Way We Live, Love, Parent, and Lead

Source: Stamping Butterflies (2004), Chapter 33 (p. 212)
“Lord, give me the heart of a child, and the awesome courage to live it out as an adult.”
Molchanie (1982)

“The human child – so much cannier at times than the stupefyingly ponderous adult.”
Source: The Book Thief