Consider the depth and difficulty of many truths, and the flattering appearances of falsehood, whence arises an infinite variety of dangers to which we are exposed in our judgment of things. Read with greediness those authors that treat of the doctrine of prejudices, prepossessions and springs of error, on purpose to make your soul watchful on all sides, that it suffer itself as far as possible to be imposed upon by none of them. See more on this subject, Logic, Part II. Chap. 3. and Part III. Chap. 3.

III. A slight view of things so momentous is not suffi eient. You should therefore contrive and practise some proper methods to acquaint yourself with your own ignorance, and to impress your mind with a deep and painful sense of the low and imperfect degrees of your present knowledge, that you may be incited with labour and activity to pursue after greater measures. Among others you may find some such methods as these successful.

1. Take a wide survey now and then of the vast and unlimited regions of learning. Let your meditations run over the names of all the sciences, with their numerous branchings, and innumerable particular themes of knowledge; and then reflect how few of them you are acquainted with in any tolerable degree. The most learned of mortals will never find occasion to act over again what is fabled of Alexander the Great; that when he had conquered what was called the Eastern World, he wept for want of more worlds to conquer. The worlds of science are immense and endless.

2. Think what a numberless variety of questions and difficulties there are belonging even to that particular

'science, in which you have made the greatest progress, and how few of them there are in which you have arriv ed at a final and undoubted certainty; excepting only those questions in the pure and simple mathematicks, whose theorems are demonstrable and leave scarce any doubt; and yet even in the pursuit of some few of these, mankind have been strangely bewildered.

'. s. Spend a few thoughts sometimes on the puzzling enquiries concerning vacuums and atoms, the doctrine of infinites, indivisibles and incommensurables, in geometry, wherein there appear some insolvable difficulties: do this on purpose to give you a more sensible impression of the poverty of your understanding, and the imperfection of your knowledge. This will teach you what a vain thing it is to fancy that you know all things, and will instruct you to think modestly of your present attainments, when every dust of the earth, and every inch of space, surmounts your understanding, and triumphs over your presumption. Arithmo had been bred up to accounts all his life, and thought himself a complete master of numbers. But when he was pushed hard to give the square root of the number 2, he tried at it, and laboured long in millesimal fractions, till he confessed there was no end of the enquiry; and yet he learnt so much modesty by this perplexing question, that he was afraid to say, it was an impossible thing. It is some good degree of improvement when we are afraid to be positive.

4. Read the accounts of those vast treasures of knowledge which some of the dead have possessed, and some of the living do possess. Read and be astonished at the almost incredible advances which have been made in sci

ence. Acquaint yourselves with some persons of great learning, that by converse among them, and comparing yourself with them, you may acquire a mean opinion of your own attainments, and may thereby be animated with new zeal, to equal them as far as possible, or to exceed : thus let your diligence be quickened by a generous and laudable emulation. If Vanillus had never met with Scitorio and Polydes, he had never imagined himself a mere novice in philosophy, nor ever set himself to study in good earnest.

Remember this, that if upon some few superficial acquirements you value, exalt and swell yourself as though you were a man of learning already, you are thereby building a most unpassable barrier against all improvement; you will lie down and indulge idleness, and rest yourself contented in the midst of deep and shameful ignorance. Multi ad scientiam pervenissent si se illuc pervenisse non putassent.

IV. Presume not too much upon a bright genius, a ready wit, and good parts, for this without labour and study will never make a man of knowledge and wisdom. This has been an unhappy temptation to persons of a vigorous and gay fancy to despise learning and study. They have been acknowledged to shine in an assembly, and sparkle in discourse on common topics, and thence they took it into their heads to abandon reading and labour, and grew old in ignorance; but when they had lost the vivacities of animal nature and youth, they became stupid and sottish even to contempt and ridicule. Lucidas and Scintillo are young men of this stamp: they shine in conversation, they spread their native riches be

fore the ignorant; they pride themselves in their own lively images of fancy, and imagine themselves wise and learned; but they had best avoid the presence of the skilful, and the test of reasoning; and I would advise them once a day to think forward a little, what a contemptible figure they will make in age.

The witty men sometimes have sense enough to know their own foible, and therefore they craftily shun the attacks of argument, or boldly pretend to despise and renounce them, because they are conscious of their own ignorance, and inwardly confess their want of acquaintance with the skill of reasoning.

6: Va As you are not to fancy yourself a learned man because you are blessed with a ready wit, so neither must you imagine that large and laborious reading, and a strong memory, can denominate you truly wise.

What that excellent critic has determined when he decided the question, whether wit or study makes the best poet, may well be applied to every sort of learning........

Or verse will never shine with a transcendent light.

OLDHAM.

C

It is meditation and studious thought, it is the exercise of your own reason and judgment upon all you read, that gives good sense even to the best genius, and affords your understanding the truest improvement. A boy of a strong memory may repeat a whole book of Euclid, yet be no geometrician; for he may not be able perhaps to demonstrate one single theorem. Memorino has learnt half the Bible by heart, and is become a living concordance, and a speaking index to theological folios, and yet he understands little of divinity.

. A well furnished library and a capacious memory, are indeed of singular use toward the improvement of the mind; but if all your learning be nothing else but a mere amassment of what others have written, without a due penetration into their meaning, and without a judicious choice and determination of your own sentiments, I do not see what title your head has to true learning above your shelves. Though you have read philosophy and theology, morals and metaphysics in abundance, and every other art and science, yet if your memory is the only faculty employed, with the neglect of your reasoning powers, you can justly claim no higher character but that of a good historian of the sciences.

Herc note, many of the foregoing advices, are more peculiarly proper for those who are conceited of their abilities, and are ready to entertain a high opinion of themselves. But a modest, humble youth, of a good genius, should not suffer himself to be discouraged by any of these considerations. They are designed only as a spur to diligence, and a guard against vanity and pride.