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cannot say he is rational, how capable soever he may be, by time and exercise, to become so
Try in men of low and mean education, who have never elevated their thoughts above the spade and the plough, nor looked beyond the ordinary drudgery of a day-labourer. Take the thoughts of such an one, used for many years to one track, out of that narrow compass, he has been all his life confined to, you will find him no more capable of reasoning than almost a perfect natural. Some one or two rules, on which their conclusion, immediately depend, you will find in most men have governel all their thoughts; these, true or false, have been the maxims they have been guided by : take these from them, and they are perfectly at a loss, their compass and polestar then are gone, and their understanding is perfectly at a nonplus ; and therefore they either immediately return to their old maxims again, as the foundations of all truth to them, notwithstanding al that can be said to show their weakness ; o: if they give them up to their reasons, they, with them, give up all truth and farther inquiry, and think there is no such thing as certainty. For if you would enlarge their thoughts, and settle them upon more remote and surer principles, they either cannot easily apprehend them ; or, if they can, know not what use to make of them ; for long deductions from remote principles are what they have not been used to, and cannot manage.
What then, can grown men never be ima proved, or enlarged in their understandings ? I say not so ; but this I think I may say, that it will not be done without industry and application, which will require more time and pains than grown men, settled in their course of life, will allow to it, and therefore very seldom is done. Anil this very capacity of attaining it, by use and exercise only, brings us back to that which I laid down before, that it is only practice that improve our ininds as well as bodies, and we must expect nothing from our understandings, any farther than they are perfected by habits
The Americans are not all born with worse understandings than the Europea is, though we see none of them have stich reaches in the arts and sciences. And, among the childre: of a poor countryman, the lucky chance of education, and getting into the world, gives one infinitely the superiority in parts over the rest, who, continuing at home, had continued also just of the same size with his brethren.
He that has to do with yomg scholars, especially in mathematics, may perceive how their minds open by degrees, and how it is exercise alone that opens them. Sometimes they will stick a long time at a part of demonstration, not for want of will and application, but really for want of perceiving the connexion of two ideas, that, to one whose understanding is more exercised, is as visible as any thing can be. The same would be with a grown man beginning to study mathematics; the understanding, for want of use, often sticks in every plain way, and he himself that is so puzzled, when he comes to see the connexion, wonders what it was he stuck at, in a case so plain.
§ 7. Mathematics.
I HAVE mentioned mathematics as a way to settle in the mind a habit of reasoning closely and in train ; not that I think it necessary that all men should be deep mathematicians, but that, having got the way of reasoning, which that study necessarily brings the mic to, they might be able to transfer it to other parts of knowledge, as they shall have occasion. For, in all sorts of reasoning, every sina" gle argument should be managed as a mathematical demonstration : the connexion and dependence of ideas should be followed, till the mind is brought to the source on which it bottoms, and observes the coherence all along, though in proofs of probability oue such train is not enough to settle the judgment, as in de monstrative knowledge.
Where a truth is made out by one demonstration, there needs no farther inquiry ; but in probabilities, where there wants demonstation to establish the truth beyond doubt, there it is not enough to trace one argument to its source, and observe its strength and weakness, but all the arguments, after having been so examined on both sides, must be laid in balance one against another, and, upon the whole, the understanding determine its assent.
This is a way of reasoning the understanding should be accustomed to, which is so different from what the illiterate are used to, that even learned men oftentimes seem to have very little or no notion of it. Nor is it to be wondered, since the way of disputing, in the schools, leads them quite away from it, by insisting on one topical argument, by the success of which the truth or falsehood of the question is to be determined, and victory adjudged to the opponent or defendant ; which is all one as if one should balance an account by one sum, charged and discharged, when there are an hundred others to be taken into consideration.
This, therefore, it would be well if mens' minds were accustomed to, and that early ; that they might not erect their opinions upon one single view, when so many other requisite to make up the account, and must come into the reckoning, before a man can form a right judgment. This would enlarge their minds, and give a due freedom to their understandings, that they might not be led into error by presumption, laziness, or precipitancy; for I think nobody can approve such a conduct of the understanding as should mislead it from truth, though it be ever so much in fashion to make use of it.
To this perhaps it will be objected, that to manage the understanding as I propose would require every man to be a scholar, and to be furnished with all the materials of knowledge, and exercised in all the ways of reasoning. To which I answer, that it is a shame for those that have time, and the means to attain knowledge, to want any helps or assistance, for the improvement of their understandings, that are to be got ; and to such I would be thought here chiefly to speak. Those methinks, who by the industry and parts of their ancestors, have been set free from a constant drudgery to their backs and their bellies, should bestow some of their spare time on their heads, and upon their minds, by some trials and essays, in all the sorts and matters of reasoning. I have before mentioned mathematics, wherein algebra gives new helps and views to the understanding. If I propose these, it is not, as I said, to make every man a thorough mathematician, or a deep algebraist ; but yet I think the study of them is of