And I myself (as I do not think that I can be accused of having, in my forensic exertions, and labours, and dangers, deserted the post in which I was stationed by the Roman people,) am bound, forsooth, to exert myself as much as I can to render my fellow-countrymen more learned by my labours and studies and diligence, and not so much to contend with those men who prefer reading Greek works, provided that they really do read them, and do not only pretend to do so; and to fall in also with the wishes of those men who are desirous either to avail themselves of both languages, or who, as long as they have good works in their own, do not care very much about similar ones in a foreign tongue. But those men who would rather that I would write on other topics should be reasonable, because I have already composed so many works that no one of my countrymen has ever published more, and perhaps I shall write even more if my life is prolonged so as to allow me to do so. And yet, whoever accustoms himself to read with care these things which I am now writing on the subject of philosophy, will come to the conclusion that no works are better worth reading than these. For what is there in life which deserves to be investigated so diligently as every subject which belongs to philosophy, and especially that which is discussed in this treatise, namely, what is the end, the object, the standard to which all the ideas of living well and acting rightly are to be referred? What it is that nature follows as the chief of all desirable things? what she avoids as the principal of all evils?
And as on this subject there is great difference of opinion among the most learned men, who can think it inconsistent with that dignity which every one allows to belong to me, to examine what is in every situation in life the best and truest good? Shall the chief men of the city, Publius Scævola and Marcus Manilius argue whether the offspring of a female slave ought to be considered the gain of the master of the slave; and shall Marcus Brutus express his dissent from their opinion, (and this is a kind of discussion giving great roomfor the display of acuteness, and one too that is of importance as regards the citizens,) and do we read, and shall we continue to read, with pleasure their writings on this subject, and the others of the same sort, and at the same time neglect these subjects, which embrace the whole of human life? There may, perhaps, be more money affected by discussions on that legal point, but beyond all question, this of ours is the more important subject: that, however, is a point which the readers may be left to decide upon. But we now think that this whole question about the ends of good and evil is, I may almost say, thoroughly explained in this treatise, in which we have endeavoured to set forth as far as we could, not only what our own opinion was, but also everything which has been advanced by each separate school of philosophy.