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

... 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.

The teacher must adopt the role of facilitator not content provider.

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

Thought is not merely expressed in words, it comes into existence through them

It may be said that the basic characteristic of human behavior in general is that humans personally influence their relations with the environment and through that environment personally change their behavior, subjugating it to their control.

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.