9. The principle on which the Pyrrhonic Scepticism, as expounded by Sextus, is founded, is the relativity of all knowledge, feeling, and sensation, the relativity of all truth, sensible, moral, and intellectual. Scepticism is in fact merely a more fully developed, more systematic, and more thoroughgoing Sophistic. Substantially the Sceptics added but little to the maxim which expresses the relativity of all human cognition, that man is the measure of the universe; but they carried out this maxim into a multiplicity of directions and details, and enforced it with abundant and superabundant illustrations. They dwelt more than the Sophists had done on the uncertainty and utter ignorance as to objective and independent truth under which we labour, in consequence of the relative character of all our sensible, intellectual, and moral impressions. It was rather to magnify the power and supremacy of man that the Sophists, or some of them at least, represented him as the measure of the universe; it was rather to convict him of an ignorance altogether irremediable, and to prove that he was utterly incompetent to attain to any degree of objective certainty and truth, that the Sceptics represented him in the same light.