The most significant moment in the course of intellectual development, which gives birth to the purely human forms of practical and abstract intelligence, occurs when speech and practical activity, two previously completely independent lines of development, converge.

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

In play, a child is always above his average age, above his daily behavior; in play, it is as though he were a head taller than himself.

Lev Vygotsky Quotes