This book collects together all that has been omitted, and in it, having exhausted my subject, I shall consider not what I am to say, but what there is which I have not yet said. If there be anything superfluous in it, I pray you take it in good part, since it is for you that it is superfluous. Had I wished to set off my work to the best advantage, I ought to have added to it by degrees, and to have kept for the last that part which would be eagerly perused even by a sated reader. However, instead of this, I have collected together all that was essential in the beginning; I am now collecting together whatever then escaped me; nor, by Hercules, if you ask me, do I think that, after the rules which govern our conduct have been stated, it is very much to the purpose to discuss the other questions which have been raised more for the exercise of our intellects than for the health of our minds. The cynic Demetrius, who in my opinion was a great man even if compared with the greatest philosophers, had an admirable saying about this, that one gained more by having a few wise precepts ready and in common use than by learning many without having them at hand.