A word devoid of thought is a dead thing, and a thought unembodied in words remains a shadow.

Language is the tool of the tools

Every function in the child's cultural development appears twice: first, on the social level, and later, on the individual level; first, between people (interpsychological) and then inside the child (intrapsychological). This applies equally to voluntary attention, to logical memory, and to the formation of concepts. All the higher functions originate as actual relationships between individuals.

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

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.

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