III. From these two different families, as it were, the one of which, while it was chiefly occupied with philosophy, still devoted some portion of its attention to the rhetorical science, and the other was wholly absorbed in the study and teaching of eloquence, but both kinds of study were united by their successors, who brought to the aid of their own pursuits those things which appeared to have been profitably said by either of them, and those and the others their predecessors are the men whom we and all our countrymen have proposed to ourselves as models, as far as we were able to make them so, and we have also contributed something from our own stores to the common stock. But if the things which are set forth in these books deserved to be selected with such great eagerness and care as they were, then certainly, neither we ourselves nor others will repent of our industry. But if we appear either rashly to have passed over some doctrine of some one worth noticing, or to have adopted it without sufficient elegance, in that case when we are taught better by some one, we will easily and cheerfully change our opinion. For what is discreditable is, not the knowing little, but the persisting foolishly and long in what one does not understand, because the one thing is attributed to the common infirmity of man, but the other to the especial fault of the individual. Wherefore we, without affirming anything positively, but making inquiry at the same time, will advance each position with some doubt, lest while we gain this trifling point of being supposed to have written this treatise with tolerable neatness, we should lose that which is of the greater importance, the credit, namely, of not adopting any idea rashly and arrogantly. But this we shall endeavour to gain both at present and during the whole course of our life with great care, as far as our abilities will enable us to do so. But at present, lest we should appear to be too prolix, we will speak of the other points which it seems desirable to insist on.