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An older child, one who possesses a conscience, will be troubled with self-reproaches and feelings of shame for his naughtiness, even if he is not discovered. But our two-year-olds and our three-year- olds experience guilt feelings only when they feel or anticipate disapproval from the outside. In doing this, they have taken the first steps toward the goal of conscience, but there is a long way ahead before the policeman outside becomes the policeman inside.
— Selma Fraiberg
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Common sense … has the very curious property of being more correct retrospectively than prospectively. It seems to me that one of the principal criteria to be applied to successful science is that its results are almost always obvious retrospectively; unfortunately, they seldom are prospectively. Common sense provides a kind of ultimate validation after science has completed its work; it seldom anticipates what science is going to discover.
— Russell L. Ackoff
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