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

Through others we become ourselves.

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

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

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.

There is reason to believe that voluntary activity, more than highly developed intellect, distinguishes humans from the animals which stand closest to them.

In play, the child is always behaving beyond his age, above his usual everyday behaviour; in play he is, as it were, a head above himself. Play contains in a concentrated form, as in the focus of a magnifying glass, all developmental tendencies; it is as if the child tries to jump above his usual level.