Respect the faculty that produces opinions. You entirely depend upon this faculty to keep from accepting those opinions that are inconsistent with the nature of things and the thinking of a rational animal.
Throwing away most opinions, hold on to the few that are true. In addition, keep in mind that we all live in only this present and indivisible moment—all the rest of life is either gone or uncertain. The time we live is short and the place we live is small. Posthumous fame is short too, and even that is kept by fallible human beings who die soon enough, never knowing themselves, much less famous people who died long ago. (III. 9-10)