The materialism of his dogmatic contemporaries placed them at a terrible disadvantage when the sceptical successor of Plato went on to show that eternal duration is incompatible with whatever we know about the constitution of corporeal substance; and this part of his argument applied as much to the Epicurean as to the Stoic religion.[246] But even a spiritualistic monotheism is not safe from his dissolving criticism. According to Carneades, a god without senses has no experience of whatever pleasurable or painful feelings accompany sensation, and is therefore, to that extent, more ignorant than a man; while to suppose that he experiences painful sensations is the same as making him obnoxious to the diminished vitality and eventual death with which they are naturally associated. And, generally speaking, all sensation involves a modification of the sentient subject by an external object, a condition necessarily implying the destructibility of the former by the latter.[247] So also, moral goodness is an essentially relative quality, inconceivable without the possibility of succumbing to temptation, which we cannot attribute to a perfect Being.[248] In a word, whatever belongs to conscious life being relative and conditioned, personality is excluded from the absolute by its very definition. As to the proofs of divine agency derived from divination, they are both irrational and weak. If all things are predetermined by God’s providence, knowledge of the future is useless, and, therefore, cannot have been given to us. Moreover, no confidence can be placed in the alleged fulfilments of prophecy; probably most of them are fictitious and the remainder accidental. For the rest, good luck is distributed without regard to merit; and the general corruption of mankind shows that, from the Stoic point of view, human nature is a complete failure.[249] Well may M. Havet say of the Academicians: ‘ce sont eux et non les partisans d’Epicure qui sont les libres penseurs de l’antiquité ou qui l’auraient voulu être; mais ils ne le pouvaient pas.’[250] They could not, for their principles were as inconsistent with an absolute negation as with an absolute affirmation; while in practice their rule was, as we have said, conformity to the custom of the country; the consequence of which was that Sceptics and Epicureans were equally assiduous in their attendance at public worship. It is, therefore, with perfect dramatic appropriateness that Cicero puts the arguments of Carneades into the mouth of Cotta, the Pontifex Maximus; and, although himself an augur, takes the negative side in a discussion on divination with his brother Quintus. And our other great authority on the sceptical side, Sextus Empiricus, is not less emphatic than Cotta in protesting his devotion to the traditional religion of the land.[251]