of indifference; if it is for the sake of pleasure, that is a matter of indifference too; if it is for the sake of virtue, that is of itself sufficient for happiness. But the methods of providing one’s self with means are ridiculous; for instance, some derive them from a king; and then it will be necessary to humour him. Some from friendship; and then friendship will become a thing to be bought with a price. Some from wisdom; and then wisdom will become mercenary; and these are the accusations which he brings.”
But since he has written many books of high reputation, it has seemed good to me to give a catalogue of them, classifying them according to their subjects. They are the following:—
Books on Logic; Propositions; Logical Questions; a book of the Contemplations of the Philosopher; six books of Dialectic Terms addressed to Metrodorus; one on the Technical Terms used in Dialectics, addressed to Zeno; one called the Art of Dialectics, addressed to