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Persius has justly observed, that knowledge is nothing to him who is not known by others to possess it[1]: to the scholar himself it is nothing with respect either to honour or advantage, for the world cannot reward those qualities which are concealed from it; with respect to others it is nothing, because it affords no help to ignorance or errour.

It is with justice, therefore, that in an accomplished character, Horace unites just sentiments with the power of expressing them; and he that has once accumulated learning, is next to consider, how he shall most widely diffuse and most agreeably impart it.

A ready man is made by conversation. He that buries himself among his manuscripts, “besprent,” as Pope expresses it, “with learned dust,” and wears out his days and nights in perpetual research and solitary meditation, is too apt to lose in his elocution what he adds to his wisdom; and when he comes into the world, to appear overloaded with his own notions, like a man armed with weapons which he cannot wield. He has no facility of inculcating his speculations, of adapting himself to the various degrees of intellect which the accidents of conversation will present; but will talk to most unintelligibly, and to all unpleasantly.

I was once present at the lectures of a profound philosopher, a man really skilled in the science which he professed, who having occasion to explain the terms opacum and pellucidum, told us, after some hesitation, that opacum was, as one might say, opake, and that pellucidum signified pellucid. Such was the dexterity with which this learned reader facilitated to his auditors the intricacies of science; and so true is it, that a man may know what he cannot teach.

Boerhaave complains, that the writers who have treated of chymistry before him, are useless to the greater part of students, because they presuppose their readers to have such degrees of skill as are not often to be found. Into the same errour are all men apt to fall, who have familiarized any subject to themselves in solitude: they discourse, as if they thought every other man had been employed in the same inquiries; and expect that short hints and obscure allusions will produce in others the same train of ideas which they excite in themselves.

Nor is this the only inconvenience which the man of study suffers from a recluse life. When he meets with an opinion that pleases him, he catches it up with eagerness; looks only after such arguments as tend to his confirmation; or spares himself the trouble of discussion, and adopts it with very little proof; indulges it long without suspicion, and in time unites it to the general body of his knowledge, and treasures it up among incontestable truths: but when he comes into the world among men who, arguing upon dissimilar principles, have been led to different conclusions, and being placed in various situations, view the same object on many sides; he finds his darling position attacked, and himself in no condition to defend it: having thought always in one train, he is in the state of a man who having fenced always with the same master, is perplexed and amazed by a new posture of his antagonist; he is entangled in unexpected difficulties, he is harassed by sudden objections, he is unprovided with solutions or replies; his surprise impedes his natural powers of reasoning, his thoughts are scattered and confounded, and he gratifies the pride of airy petulance with an easy victory.

It is difficult to imagine, with what obstinacy truths which one mind perceives almost by intuition, will be rejected by another; and how many artifices must be practised, to procure admission for the most evident propositions into understandings frighted by their novelty, or hardened against them by accidental prejudice; it can scarcely be conceived, how frequently, in these extemporaneous controversies, the dull will be subtle, and the acute absurd; how often stupidity will elude the force of argument, by involving itself in its own gloom; and mistaken ingenuity will weave artful fallacies, which reason can scarcely find means to disentangle.