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

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

... People with great passions, people who accomplish great deeds, people who possess strong feelings, even people with great minds and a strong personality, rarely come out of good little boys and girls.

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

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.

The specifically human capacity for language enables children to provide for auxiliary tools in the solution of difficult tasks, to overcome impulsive action, to plan a solution to a problem prior to its execution, and to master their own behavior.

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