These cases are not alike, Cato. For in theseinstances, though you may have made a good deal of progress, still you are in exactly the same evil from which you wish to be free, till you have entirely escaped. For a man does not breathe till he has entirely emerged, and puppies are just as blind till they have opened their eyes, as if they were never going to open them. I will give you some instances that really are like. One man's eyes are bad, another is weak in his body; these men are both gradually relieved by the daily application of remedies. The one gets better every day, and the other sees better. Now these men resemble all those who study virtue. They are relieved of their vices; they are relieved of their errors. Unless, perchance, you think that Tiberius Gracchus, the father, was not happier than his son, when the one laboured to establish the republic, and the other to subvert it. And yet he was not a wise man. For who taught him wisdom? or when? or where? or whence did he learn it? Still, because he consulted his twin glory and dignity, he had made great progress in virtue.
But I will compare your grandfather, Drusus, with Caius Gracchus, who was nearly his contemporary. He healed the wounds which the other inflicted on the republic. But there is nothing which makes men so miserable as impiety and wickedness. Grant that all those who are unwise are miserable, as, in fact, they are; still he is not equally miserable who consults the interest of his country with him who wishes for its destruction. Therefore, those men are already a great deal relieved from their vices who have made any considerable advance towards virtue. But the men of your school admit that advance towards virtue can be made, but yet assert that no relief from vices takes place in consequence.
But it is worth while to consider on what arguments acute men rely for proving this point. Those arts, say they, of which the perfection can be increased, show that the completeness of their contraries can likewise be increased. But no addition can be made to the perfection of virtue. Therefore, also, vices will not be susceptible of any increase, for they are the contraries of virtues. Shall we say, then, that things which are doubtful are made plain by things which are evident, or that things which are evident are obscured by things that are doubtful? But this is evident, that different vices are greater in different people. This is doubtful, whetherany addition can be made to that which you call the chief good. But you, while what you ought to do is to try and illustrate what is doubtful by what is evident, endeavour to get rid of what is evident by what is doubtful. And, therefore, you will find yourself hampered by the same reasoning which I used just now. For if it follows that some vices are not greater than others, because no addition can be made to that chief good which you describe, since it is quite evident that the vices of all men are not equal, you must change your definition of the chief good. For we must inevitably maintain this rule, that when a consequence is false, the premises from which the consequence proceeds cannot be true.