A child’s greatest achievements are possible in play, achievements that tomorrow will become her basic level of real action.

What children can do with the assistance of others might be in some sense even more indicative of their mental development than what they can do alone

Any human act that gives rise to something new is referred to as a creative act, regardless of whether what is created is a physical object or some mental or emotional construct that lives within the person who created it and is known only to him.

The only 'good' learning is that which is in advance of development.

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

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.

Childhood is a complex dialectical process characterized by periodicity, unevenness in the development of different functions, metamorphosis or qualitative transformation of one form into another, intertwining of external and internal factors, and adaptive processes which overcome impediments that the child encounters.