The Sophists start by postulating that there are no limits to what education can accomplish and they maintain, in contrast to the old mystical belief in breeding, that ‘virtue’ can be taught. Western culture, which is based on self-consciousness, self-observation and self-criticism, has its origin in their idea of education. They initiated the history of Western rationalism, with its criticism of dogmas, myths, traditions and conventions. They are the discoverers of historical relativity—the recognition that scientific truths, ethical standards and religious creeds are all historically conditioned. They are the first to realize that all norms and standards, whether in science, law, morality, mythology or art, are creations of human minds and hands. They discover the relativity of truth and falsehood, right and wrong, good and evil. They recognize the pragmatic motives underlying human valuations, and thus pave the way for all subsequent endeavour in the field of humanistic enlightenment. It is to be noted that their rationalism and relativism are connected with the same trend of economy and the same general impulse towards free competition and moneymaking as gave rise to the Renaissance emancipation of science, the enlightenment of the eighteenth century and the materialism of the nineteenth. Their experience of ancient capitalism aroused the same reactions in them as the experience of modern capitalism does in their successors.
Arnold Hauser The Social History of Art: Volume 1: From Prehistoric Times to the Middle Ages