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

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

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.

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.

Human learning presupposes a specific social nature and a process by which children grow into the intellectual life of those around them

Experience teaches us that thought does not express itself in words, but rather realizes itself in them

Through others we become ourselves.