What a child can do today with assistance, she will be able to do by herself tomorrow.

The true direction of the development of thinking is not from the individual to the social, but from the social to the individual.

Thought is not merely expressed in words, it comes into existence through them

By giving our students practice in talking with others, we give them frames for thinking on their own.

Language is the tool of the tools

Learning is more than the acquisition of the ability to think; it is the acquisition of many specialized abilities for thinking about a variety of things.

Psychology teaches us at every step that though two types of activity can have the same external manifestation, whether in origin or essence, their nature may differ most profoundly.