“Failure is instructive. The person who really thinks learns quite as much from his failures as from his successes.”

“We do not learn from experience... we learn from reflecting on experience.”

“Give the pupils something to do, not something to learn; and the doing is of such a nature as to demand thinking; learning naturally results.”

“Every one has experienced how learning an appropriate name for what was dim and vague cleared up and crystallized the whole matter. Some meaning seems distinct almost within reach, but is elusive; it refuses to condense into definite form; the attaching of a word somehow (just how, it is almost impossible to say) puts limits around the meaning, draws it out from the void, makes it stand out as an entity on its own account.”

“Every great advance in science has issued from a new audacity of imagination. ”

“Scientific principles and laws do not lie on the surface of nature. They are hidden, and must be wrested from nature by an active and elaborate technique of inquiry. ”

“The most important attitude that can be formed is that of desire to go on learning.”