How necessary our appetites and passions are for the welfare of all trades and handicrafts, has been sufficiently proved throughout the book, and that they are our bad qualities, or at least produce them, nobody denies. It remains then, that I should set forth the variety of obstacles that hinder and perplex man in the labour he is constantly employed in, the procuring of what he wants; and which in other words is called the business of self-preservation: while, at the same time, I demonstrate that the sociableness of man arises only from these two things, viz. the multiplicity of his desires, and the continual opposition he meets with in his endeavours to gratify them. The obstacles I speak of, relate either to our own frame, or the globe we inhabit, I mean the condition of it, since it has been cursed. I have often endeavoured to contemplate separately on the two things I named last, but could never keep them asunder; they always interfere and mix with one another; and at last make up together a frightful chaos of evil. All the elements are our enemies, water drowns and fire consumes those who unskilfully approach them. The earth in a thousand places produces plants, and other vegetables that are hurtful to man, while she feeds and cherishes a variety of creatures that are noxious to him; and suffers a legion of poisons to dwell within her: but the most unkind of all the elements is that which we cannot live one moment without: it is impossible to repeat all the injuries we receive from the wind and weather; and though the greatest part of mankind, have ever been employed in defending their species from the inclemency of the air, yet no art or labour have hitherto been able to find a security against the wild rage of some meteors. Hurricanes, it is true, happen but seldom, and few men are swallowed up by earthquakes, or devoured by lions; but while we escape those gigantic mischiefs, we are persecuted by trifles. What a vast variety of insects are tormenting to us; what multitudes of them insult and make game of us with impunity! The most despicable scruple not to trample and graze upon us as cattle do upon a field: which yet is often born with, if moderately they use their fortune; but here again our clemency becomes a vice, and so encroaching are their cruelty and contempt of us on our pity, that they make laystalls of our hands, and devour our young ones if we are not daily vigilant in pursuing and destroying them.