“...rich geometric experiences are the most important factor in the development of children's spatial thinking and reasoning.”

“No one is born with prejudicial feelings, they are developed and nurtured within us by our experiences and upbringing. Consider the many factors involved: Babies are born into rich families and poor families alike - each capable of developing resentment toward the other. Children will often adopt prejudicial attitudes from their parents' racist remarks and actions. There are always two sides of the train tracks, with people on each side often unwilling to cross. One negative experience with a person may lead to false stereotyping for an entire people group.”

“The most important step in developing skillful speech is to think before speaking.”

“Science is not simply a matter of observing the world, experimenting with its elements and drawing reasonable conclusions. Otherwise, we would have to recognize children, so-called primitives and a good many animals as excellent scientists. But the practical experiments carried out by all of us every day lack a few necessary factors, the first and most important of which is the concept of the universe as a single entity operating under universal, rational, knowable laws. Without this foundation, science cannot operate as such.”

“The reasons that drive me to write are many and the most important are the most secret, I think. Perhaps most of all this: to put something out of death's reach.”

“Raising children is, in a sense, the reason the society exists in the first place. It's the most important thing that happens, and it's the culmination of all the tools and language and social structure that has evolved.”