"Does this fact prevent them from combatting disease victoriously?

"And since we are speaking of common sense we shall not hesitate to
invoke it in this instance, and all will agree that it should dictate
our reply.

"Then why could we not do for the soul that which can be done for the
body?

"It is first from books, then from the lessons of life that physicians
learn the principles underlying their knowledge of disease and its
healing remedies.

"Is it absolutely indispensable for us to poison ourselves in order to
know that such and such a plant is harmful and that another contains the
healing substance which destroys the effects of the poison?

"We may all possess wisdom if we are willing to be persuaded that the
experience of others is as useful as our own."

The events which multiply about us, Yoritomo says, ought to be, for each
master, an opportunity for awakening in the soul of his disciples a
perfect reasoning power, starting from the inception of the premises to
arrive at the conclusions of all arguments.

From the repetition of events, from their correlation, from their
equivalence, from their parallelism, knowledge will be derived and will
be productive of good results, in proportion as egotistical sentiment is
eliminated from them; and slowly, with the wisdom acquired by experience,
common sense will manifest itself tranquil and redoubtable, working