ONE:In order to examine once more the state of affairs around Lige, I decided to pay another visit to that town.It remains to be seen whether the system which we are examining is consistent with itself. It is not. The Prime Mover, being unextended, cannot be located outside the sidereal sphere; nor can he be brought into immediate contact with it more than with any other part of the cosmos. If the aether has a motion proper to itself, then no spiritual agency is required to keep it in perpetual rotation. If the crystalline spheres fit accurately together, as they must, to avoid leaving a vacuum anywhere, there can be no friction, no production of heat, and consequently no effect produced on the sublunary sphere. Finally, no rotatory or other movement can, taken alone, have any conceivable connexion with the realisation of a possibility, in the sense of progress from a lower to a higher state of being. It is merely the perpetual exchange of one indifferent position for another.
THREE:We may also suspect that Plato was dissatisfied not only with the positive results obtained by Socrates, but also with the Socratic method of constructing general definitions. To rise from the part to the whole, from particular instances to general notions, was a popular rather than a scientific process; and sometimes it only amounted to taking the current explanations and modifying them to suit the exigencies of ordinary experience. The resulting definitions could never be more than tentative, and a skilful dialectician could always upset them by producing an unlooked-for exception, or by discovering an ambiguity in the terms by which they were conveyed.
THREE:268It will now be better understood whence arose the hostility of the Stoics to pleasure, and how they could speak of it in what seems such a paradoxical style. It was subjective feeling as opposed to objective law; it was relative, particular, and individual, as opposed to their formal standard of right; and it was continually drawing men away from their true nature by acting as a temptation to vice. Thus, probably for the last reason, Cleanthes could speak of pleasure as contrary to Nature; while less rigorous authorities regarded it as absolutely indifferent, being a consequence of natural actions, not an essential element in their performance. And when their opponents pointed to the universal desire for pleasure as a proof that it was the natural end of animated beings, the Stoics answered that what Nature had in view was not pleasure at all, but the preservation of life itself.48