I know not whether any other reason than this idleness of imitation can be assigned for that uniform and constant partiality, by which some vices have hitherto escaped censure, and some virtues wanted recommendation; nor can I discover why else we have been warned only against part of our enemies, while the rest have been suffered to steal upon us without notice; why the heart has on one side been doubly fortified, and laid open on the other to the incursions of errour, and the ravages of vice. Among the favourite topicks of moral declamation, may be numbered the miscarriages of imprudent boldness, and the folly of attempts beyond our power. Every page of every philosopher is crowded with examples of temerity that sunk under burdens which she laid upon herself, and called out enemies to battle by whom she was destroyed. Their remarks are too just to be disputed, and too salutary to be rejected; but there is likewise some danger lest timorous prudence should be inculcated, till courage and enterprise are wholly repressed, and the mind congealed in perpetual inactivity by the fatal influence of frigorifick wisdom. Every man should, indeed, carefully compare his force with his undertaking; for though we ought not to live only for our own sakes, and though therefore danger or difficulty should not be avoided merely because we may expose ourselves to misery or disgrace; yet it may be justly required of us, not to throw away our lives upon inadequate and hopeless designs, since we might, by a just estimate of our abilities, become more useful to mankind. There is an irrational contempt of danger, which approaches nearly to the folly, if not the guilt of suicide; there is a ridiculous perseverance in impracticable schemes, which is justly punished with ignominy and reproach. But in the wide regions of probability, which are the proper province of prudence and election, there is always room to deviate on either side of rectitude without rushing against apparent absurdity; and according to the inclinations of nature, or the impressions of precept, the daring and the cautious may move in different directions without touching upon rashness or cowardice. That there is a middle path which it is every man's duty to find, and to keep, is unanimously confessed: but it is likewise acknowledged that this middle path is so narrow, that it cannot easily be discovered, and so little beaten, that there are no certain marks by which it can be followed: the care, therefore, of all those who conduct others has been, that whenever they decline into obliquities, they should tend towards the side of safety.