The child’s progress does not depend only on his age, but also on being free to look around him.

A child needs freedom within limits.

Never help a child with a task that they feel they can complete themselves.

What is a scientist?... We give the name scientist to the type of man who has felt experiment to be a means guiding him to search out the deep truth of life, to lift a veil from its fascinating secrets, and who, in this pursuit, has felt arising within him a love for the mysteries of nature, so passionate as to annihilate the thought of himself.

It follows that at the beginning of his life the individual can accomplish wonders without effort and quite unconsciously.

The only language men ever speak perfectly is the one they learn in babyhood, when no one can teach them anything!

Every great cause is born from repeated failures and from imperfect achievements.