No matter how vast your knowledge or how modest, it is your own mind that has
to acquire it. It is only with your own knowledge that you can deal. It is only
your own knowledge that you can claim to possess or ask others to consider.
Your mind is your only judge of truth—and if others dissent from your verdict,
reality is the court of final appeal. Nothing but a man’s mind can perform that
complex, delicate, crucial process of identification which is thinking. Nothing
can direct the process but his own judgment. Nothing can direct his judgment
but his moral integrity.