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LETTER XVIII. - Vicesimus Knox, The Works of Vicesimus Knox, vol. 5 [1824]

Edition used:

The Works of Vicesimus Knox, D.D. with a Biographical Preface. In Seven Volumes (London: J. Mawman, 1824). Vol. 5.

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LETTER XVIII.

My Lord,

We can neither write, speak, nor think justly, however plausibly, without reasoning conclusively. If there is an art then, which undertakes to improve us in the power of using our reason, let us earnestly seek its assistance. Such is the art of Logic.

You may speak fluently, rhetorically, and perhaps agreeably, without it; but not solidly. A plain-speaking and clear-headed man, may rise and refute the whole of your harangue, if it is illogical, by two or three well-argued sentences without a single trope.

Let us then, my Lord, lay in a store of Logic, as a foundation for our rhetoric. When we shall have fixed a firm foundation, we may adorn our front, as much as we please, with festoons, Corinthian pillars, friezes, and cornices.

But is Logic able to effect what it pretends? Perhaps not quite so much; but judiciously cultivated, it can do a great deal, and it is well worth some share of your attention. Besides, you cannot be a general scholar, which I wish you to be, without some acquaintance with this celebrated art, merely as a branch of literature.

The Logic books which I advise you to procure are; those of Wallis, Sanderson, Aldrich, Watts, and Duncan. Watt's Logic, read in select parts, will perhaps answer your purpose; but I advise you to inspect the others, that you may form a just idea of the scholastic terms, and the language of logicians.

That part of the Logic books which treats of sophisms, is particularly worthy of your study. It may enable you to detect fallacies in the speeches of your opponents, and to avoid them in your own. It may teach you to confute a long harangue with a single observation.

You will in course perfect yourself in the art of making syllogisms; and I am under no apprehension of your dwelling on logical subtilties, so as to lose much time, or cool the ardour of your genius, formed, as it is, for livelier and more active pursuits.

But, my Lord, give me leave to advise you to apply the art of Logic, where it is much wanted, and has seldom been closely followed, to common life. You will there find it of great advantage. People are for ever reasoning wrong in common conversation, and on the motives and consequences of their daily conduct. From the want of just thought and accurate reasoning on common emergencies, they hastily form wrong conclusions, and fall into foolish actions; the slaves of prejudice, ignorance, passion, and absurdity. All this might easily be avoided, by exercising plain common sense, sufficiently informed; or, in other words, by sound Logic.

You will derive much happiness and dignity from accustoming yourself to submit your fancies, humours, caprices, and all your eager desires, to the touchstone of a syllogism. When any new question arises in common life, no less than books, which requires a sound judgment, form the matter into a syllogism, and abide by the conclusion, whatever it may be, faithfully and resolutely. By using yourself to this method in little things, you will naturally adopt it in great ones; and the result will be, sound judgment in writing, speaking, and acting; decision in thought, and firmness in conduct.

A most valuable effect this, of studying in the school of Aristotle. It will give you a superiority over more than half mankind, who seldom allow themselves time to reason closely and justly, if they reason at all.

I am, &c.