'Thou dost not doubt, I suppose, that it is natural for the feet to discharge this function?' 'No; surely I do not.' 'Now, if one man who is able to use his feet walks, and another to whom the natural use of his feet is wanting tries to walk on his hands, which of the two wouldst thou rightly esteem the stronger?' 'Go on,' said I; 'no one can question but that he who has the natural capacity has more strength than he who has it not.' 'Now, the supreme good is set up as the end alike for the bad and for the good; but the good seek it through the natural action of the virtues, whereas the bad try to attain this same good through all manner of concupiscence, which is not the natural way of attaining good. Or dost thou think otherwise?' 'Nay; rather, one further consequence is clear to me: for from my admissions it must needs follow that the good have power, and the bad are impotent.' 'Thou anticipatest rightly, and that as physicians reckon is a sign that nature is set working, and is throwing off the disease. But, since I see thee so ready at understanding, I will heap proof on proof. Look how manifest is the extremity of vicious men's weakness; they cannot even reach that goal to which the aim of nature leads and almost constrains them. What if they were left without this mighty, this well-nigh irresistible help of nature's guidance! Consider also how momentous is the powerlessness which incapacitates the wicked. Not light or trivial[L] are the prizes which they contend for, but which they cannot win or hold; nay, their failure concerns the very sum and crown of things. Poor wretches! they fail to compass even that for which they toil day and night. Herein also the strength of the good conspicuously appears. For just as thou wouldst judge him to be the strongest walker whose legs could carry him to a point beyond which no further advance was possible, so must thou needs account him strong in power who so attains the end of his desires that nothing further to be desired lies beyond. Whence follows the obvious conclusion that they who are wicked are seen likewise to be wholly destitute of strength. For why do they forsake virtue and follow vice? Is it from ignorance of what is good? Well, what is more weak and feeble than the blindness of ignorance? Do they know what they ought to follow, but lust drives them aside out of the way? If it be so, they are still frail by reason of their incontinence, for they cannot fight against vice. Or do they knowingly and wilfully forsake the good and turn aside to vice? Why, at this rate, they not only cease to have power, but cease to be at all. For they who forsake the common end of all things that are, they likewise also cease to be at all. Now, to some it may seem strange that we should assert that the bad, who form the greater part of mankind, do not exist. But the fact is so. I do not, indeed, deny that they who are bad are bad, but that they _are_ in an unqualified and absolute sense I deny.