'The carrying out of any human action depends upon two things—to wit, will and power; if either be wanting, nothing can be accomplished. For if the will be lacking, no attempt at all is made to do what is not willed; whereas if there be no power, the will is all in vain. And so, if thou seest any man wishing to attain some end, yet utterly failing to attain it, thou canst not doubt that he lacked the power of getting what he wished for.'
'Why, certainly not; there is no denying it.'
'Canst thou, then, doubt that he whom thou seest to have accomplished what he willed had also the power to accomplish it?'
'Of course not.'
'Then, in respect of what he can accomplish a man is to be reckoned strong, in respect of what he cannot accomplish weak?'
'Granted,' said I.
'Then, dost thou remember that, by our former reasonings, it was concluded that the whole aim of man's will, though the means of pursuit vary, is set intently upon happiness?'
'I do remember that this, too, was proved.'
'Dost thou also call to mind how happiness is absolute good, and therefore that, when happiness is sought, it is good which is in all cases the object of desire?'
'Nay, I do not so much call to mind as keep it fixed in my memory.'
'Then, all men, good and bad alike, with one indistinguishable purpose strive to reach good?'
'Yes, that follows.'