Note 44 — Chapter V · LOGIC OF THE STOICS.

(d) The standard of truth. (α) Practical need of such a standard. From these considerations it follows that in the last resort only a relative distinction is left whereby the truth of notions may be tested. Even the general argument for the possibility of knowledge starts with the Stoics by practically taking something for granted. Without failing to urge intellectual objections—and often most pertinent ones44—against Scepticism, as was indeed natural, particularly since the time of Chrysippus,45 the Stoics nevertheless specially took up their stand on one point, which was this, that, unless the knowledge of truth were possible, it would be impossible to act on fixed principles and convictions.46 Thus, as a last bulwark against doubt, practical needs are appealed to.