“Arriving at one goal is the starting point to another.”

“To find out what one is fitted to do, and to secure an opportunity to do it, is the key to happiness.”

“Faith in the possibilities of continued and rigorous inquiry does not limit access to truth to any channel or scheme of things. It does not first say that truth is universal and then add there is but one road to it.”

“Forty years spent in wandering in a wilderness like that of the present is not a sad fate--unless one attempts to make himself believe that the wilderness is after all itself the promised land”

“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. ”