Of all the causes which conspire to blind Man's erring judgment and misguide the mind, What the weak head with strongest bias rules, Is pride, the never-failing vice of fools. Whatever nature has in worth denied, She gives in large recruits of needful pride; For as in bodies, thus in souls, we find What wants in blood and spirits, swelled with wind: Pride where wit fails steps in to our defense, And fills up all the mighty void of sense. If once right reason drives that cloud away, Truth breaks upon us with resistless day Trust not yourself, but your defects to know, Make use of every friend--and every foe. A little learning is a dangerous thing Drink deep, or taste not the Pierian spring [216] There shallow draughts intoxicate the brain, And drinking largely sobers us again. Fired at first sight with what the muse imparts, In fearless youth we tempt the heights of arts While from the bounded level of our mind Short views we take nor see the lengths behind But more advanced behold with strange surprise, New distant scenes of endless science rise! So pleased at first the towering Alps we try, Mount o'er the vales and seem to tread the sky, The eternal snows appear already passed And the first clouds and mountains seem the last. But those attained we tremble to survey The growing labors of the lengthened way The increasing prospect tires our wandering eyes, Hills peep o'er hills and Alps on Alps arise! A perfect judge will read each work of wit With the same spirit that its author writ Survey the whole nor seek slight faults to find Where nature moves and rapture warms the mind, Nor lose for that malignant dull delight The generous pleasure to be charmed with wit But in such lays as neither ebb nor flow, Correctly cold and regularly low That, shunning faults, one quiet tenor keep; We cannot blame indeed--but we may sleep. In wit, as nature, what affects our hearts Is not the exactness of peculiar parts, 'Tis not a lip, or eye, we beauty call, But the joint force and full result of all. Thus, when we view some well proportioned dome (The worlds just wonder, and even thine, O Rome!), [248] No single parts unequally surprise, All comes united to the admiring eyes; No monstrous height or breadth, or length, appear; The whole at once is bold, and regular.