These qualities are two relatives very near of kin; but, just for this reason, they must not be confounded.
While common sense is applied to all the circumstances of life, practical sense is applicable to useful things.
Common sense admits a very subtle logic which is, at times, a little complex.
Practical sense reasons, starting from one point only; viz., material conveniences.
It is possible for this sense to be spoiled by egotism, if common sense does not come to its assistance.
It is by applying the discipline of reasoning to practical sense that it modifies simple sense perception by urging it to ally itself with logic, which unites thought to sentiment and reason.
"The association of common sense and practical sense is necessary," says Yoritomo, "in order to produce new forms, at the same time restraining the imagination within the limits of the most exact deductions and of the most impartial judgment."
Science is, in reality, a sort of common sense to which the rules of reasoning are applied, and is supported by arguments which practical sense directs into productive channels.
That which is called great common sense is none other than a quality with which people are endowed who show great mental equilibrium whenever it is a question of resolving material problems.
These people are generally country people or persons of humble position, whose physical organism has been developed without paying much attention to their intellectual education; they are, in fact, perfect candidates for the attainment of common sense, without having been educated to this end.
Their aptitude results from a constant habit of reflection which, rendering their attention very keen, has permitted them to observe the most minute details, therefore they can form correct conclusions, when it is a question of things that are familiar to them.
A peasant who has been taught by nature will be more skilled in prophesying about the weather than others.
He will also know how to assign a limit to the daily working hours, at the same time stating the maximum time which one can give without developing repulsion, which follows excesses of all kinds.
In his thought, very simple, but very direct, will be formulated this perfect reasoning:
Health is the first of all blessings, since without it we are incapable of appreciating the other joys of life.
If I compromise this possession I shall be insensible to all others.
It is, therefore, indispensable that I should measure my efforts, for, admitting that a certain exaggerated labor brings me a fortune, I shall not know how to enjoy it if illness accompanies it.
This is the logic which is called practical sense.
Yoritomo continues, saying that there is a very close connection between the faculty of judging and that of deducing.
"Practical sense, allied to common sense, comes to the assistance of the latter, when it is tempted to reject the chain of analogy, whose representation too often draws one far from the initial subject.
"It facilitates coordination, clearness, and precision of thought.
"It knows how to consider contingencies, and never fails to have a clear understanding of relative questions."
And to illustrate his theory, he cites us an example which many of our young contemporaries would do well to remember.
"There was," said he, "in the village of Fu-Isher, a literary man, who wrote beautiful poems.
"He lived in great solitude, and no one would have heard of his existence if it had not been that my master, Lang-Ho, while walking in the woods one day, was attracted by the harmonious sounds of poetry, which this young man was reciting, without thinking that he had any other listeners than the birds of the forest.
"Lang-Ho made himself known to him and began to question him.
"He learned that he did not lack ambition, but, being poor, and having no means of approaching those who would have been able to patronize him, he was singing of nature for his own pleasure, waiting patiently until he should be able to influence the powerful ones of the earth to share his appreciation.
"Lang-Ho, touched by his youth and his ardor, pointed out to him the dwelling of a prince, a patron of the arts, and, at the same time, told him how he ought to address the nobleman, assuring him that the fact of his being a messenger from a friend of the prince would open the doors of the palace to him.
"The next day the young poet presented himself at the home of the great lord, who, knowing that he had been sent by Lang-Ho, received him in spite of the fact that he was suffering intensely from a violent headache.
"He learned from the young man that he was a poet and treated him with great consideration, making him understand, however, that all sustained mental effort was insupportable to him on that day.
"But the poet, not paying attention to the prince's exprest desire, unrolled his manuscripts and began reading an interminable ode without noticing the signs of impatience shown by his august hearer.
"He did not have the pleasure of finishing it.
"The prince, seeing that the reader did not understand his importunity, struck a gong and ordered the servant who appeared to conduct the young man out of his presence.
"Later, he declared to Lang-Ho that his protégé had no talent at all, and reprimanded him severely for having sent the poet to the palace.
"But my master did not like to be thus criticized.
"So, a little while after that, one day, when that same prince was in an agreeable frame of mind, Lang-Ho invited him to the reading of one of his works.
"The nobleman declared that he had never heard anything more beautiful.
"'That is true,' said Lang-Ho, 'but you ought to have said this the first time you heard it.'
"And he revealed to the prince that these verses were those of the young man whom he had judged so harshly."
From this story two lessons may be drawn:
The first is, that if common sense indicates that judgment should not change from scorn to enthusiasm, when it is a question of the same object, practical sense insists that one should be certain of impartiality of judgment, by avoiding the influence of questions which relate to environment and surrounding circumstances.
The second concerns opportunity.
We have already had occasion to say how much some things, which seem desirable at certain times, are questionable when the situation changes.
Bad humor creates ill-will; therefore it is abominably stupid to provoke the manifestation of the second when one has proved the existence of the first.
In order that there may be a connection between the faculty of judgment and that of deduction, it is essential that nothing should be allowed to interpose itself between these two phases of the argument.
Harmony between all judgments is founded on common sense, but it is practical common sense, which indicates this harmony with precision.
It is also practical common sense which serves as a guide to the orator who wishes to impress his audience.
He will endeavor first to choose a subject which will interest those who listen to him.
In this endeavor he ought, above all, to consult opportunity.
And, as we have remarked on many occasions, the Shogun expresses theories on this subject, to which the people of the twentieth century could not give too much earnest consideration.
"There are," said he, "social questions, as, for example, dress and custom.
"With time, opinions change, as do forms and manners, and this is quite reasonabl............