synthesis of all the elements which compose common sense.

He who wishes to acquire common sense should be impregnated with all that
has preceded.

Then he will discipline himself, so as to be able to judge, by himself,
of the degree of reason which he has the right to assume.

He will begin by evoking some subject, comparing its visual forms with,
those forms which he understands the best, in other words, to the
perceptions which are the most familiar to him.

If it concerns a question to be solved, he will try to recall some
similar subject, and establish harmony, by making them both relative to a
common antecedent.

Yoritomo advises choosing simple thoughts for the beginning.

"One will say, for example:

"Such a substance is a poison; the seeds of this fruit contain a weak
dose of it; these seeds could then become a dangerous food, if one
absorbed a considerable quantity.

"Common sense will thus indicate a certain abstaining from eating of it.

"Then one may extend his argument to things of a greater importance, but
taking great care to keep within the narrow limits of rudimentary logic.

"One must be impregnated with this principle: