Whatever is done skilfully appears to be done with ease; and art, when it is once matured to habit, vanishes from observation. We are therefore more powerfully excited to emulation, by those who have attained the highest degree of excellence, and whom we can therefore with least reason hope to equal. In adjusting the probability of success by a previous consideration of the undertaking, we are equally in danger of deceiving ourselves. It is never easy, nor often possible, to comprise the series of any process with all its circumstances, incidents, and variations, in a speculative scheme. Experience soon shows us the tortuosities of imaginary rectitude, the complications of simplicity, and the asperities of smoothness. Sudden difficulties often start up from the ambushes of art, stop the career of activity, repress the gaiety of confidence, and when we imagine ourselves almost at the end of our labours, drive us back to new plans and different measures. There are many things which we every day see others unable to perform, and perhaps have even ourselves miscarried in attempting; and yet can hardly allow to be difficult; nor can we forbear to wonder afresh at every new failure, or to promise certainty of success to our next essay; but when we try, the same hindrances recur, the same inability is perceived, and the vexation of disappointment must again be suffered. Of the various kinds of speaking or writing, which serve necessity, or promote pleasure, none appears so artless or easy as simple narration; for what should make him that knows the whole order and progress of an affair unable to relate it? Yet we hourly find such as endeavour to entertain or instruct us by recitals, clouding the facts which they intend to illustrate, and losing themselves and their auditors in wilds and mazes, in digression and confusion. When we have congratulated ourselves upon a new opportunity of inquiry, and new means of information, it often happens, that without designing either deceit or concealment, without ignorance of the fact, or unwillingness to disclose it, the relator fills the ear with empty sounds, harasses the attention with fruitless impatience, and disturbs the imagination by a tumult of events, without order of time, or train of consequence.