Book 9
11.87
The ninth mode has to do with perpetuity, strangeness, or rarity. Thus earthquakes are no surprise to those among whom they constantly take place; nor is the sun, for it is seen every day.As contrasted, e.g., with a comet; cf. Sext. Emp. Pyrrh. Hyp. i. 141. This ninth mode is put eighth by Favorinus and tenth by Sextus and Aenesidemus; moreover the tenth is put eighth by Sextus and ninth by Favorinus.
11.87
The tenth mode rests on inter-relation, e.g. between light and heavy, strong and weak, greater and less, up and down. Thus that which is on the right is not so by nature, but is so understood in virtue of its position with respect to something else; for, if that change its position, the thing is no longer on the right.
11.88
Similarly father and brother are relative terms, day is relative to the sun, and all things relative to our mind. Thus relative terms are in and by themselves unknowable. These, then, are the ten modes of perplexity.
