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

“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.”

“Like the soil, mind is fertilized while it lies fallow, until a new burst of bloom ensues.”

“The two limits of every unit of thinking are a perplexed, troubled, or confused situation at the beginning, and a cleared up, unified, resolved situation at the close.”

“The educational process has no end beyond itself; it is its own end.”

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

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