“They do not fail either to exaggerate the reasons which plead in favor of this decision; also we see many persons suffer from reasoning, instead of feeling the good effects of it.”

Those who cultivate common sense will never fall into this error, for they will have no difficulty in convincing themselves that by acting thus they do not deceive any one except themselves.

By glossing over truth in order to weaken the logical consequences of deductions they are the first to be the victims of this childish trick.

That which is called false deduction is rarely aught save the desire to escape a resolution which a just appraisement would not fail to dictate.

It might be, also, that this twisting of judgment comes from a person having been, in some past time, subjected to unfortunate influences.

By devoting oneself to the evolution of thought, of which we have already spoken when presenting the symbolical fan, and above all, by adopting the precepts which, following the method of Yoritomo, we are going to develop in the following lessons, we shall certainly succeed in checking the errors of false reasoning.

“The important thing,” said he, “is not to let wander the thought, which, after resting for a moment on the subject with which we are concerned and after touching lightly on ideas of a similar character, begins to stray very far from its basic principles.

“Have you noted the flight of certain birds?

“They commence by gathering at one point, then they describe a series of circles around this point, at first very small, but whose circumference enlarges at every sweep.

“Little by little the central point is abandoned, they no longer approach it, and disappear in the sky, drawn by their fancy toward another point which they will leave very soon.

“The thoughts of one who does not know how to gather them together and to concentrate them are like these birds.

“They start from a central point, then spread out, at first without getting far from this center, but soon they lose sight of it and fly toward a totally different subject that a mental representation has just produced.

“And this lasts until the moment when, in a sudden movement, the first one is conscious of this wandering tendency.

“But it is often too late to bring back these wanderers to the initial idea, for, in the course of their circuits, they have brushed against a hundred others, which are confounded with the first, weaken it, and take away its exact proportions.

“The great stumbling-block again is that of becoming lost in the details whose multiplicity prevents us from discerning their complete function in the act of practising deduction.

“It is better, in the case where our perception finds itself assailed by the multitude of these details, to proceed by the process of elimination, in order not to become involved in useless and lazy efforts.