The child is not a prisoner of its inheritance; it holds its inheritance as a new creation which its future actions will unfold.

Knowledge is not a loose-leaf notebook of facts. Above all, it is a responsibility for the integrity of what we are, primarily of what we are as ethical creatures.

The child is not a prisoner of its inheritance; it holds its inheritance as a new creation which its future actions will unfold.

When Da Vinci wanted an effect, he willed, he planned the means to make it happen: that was the purpose of his machines. But the machines of Newton ... are means not for doing but for observing. He saw an effect, and he looked for its cause.

Man masters nature not by force but by understanding. This is why science has succeeded where magic failed: because it has looked for no spell to cast over nature.

A genius is a man who has two great ideas.

The hand is the cutting edge of the mind.