Man is the measure of all things', said the Sophist Protagora (c. 485-410 B.C.). By that he meant that the question of whether a thing is right or wrong, good or bad, must always be considered in relation to a person's needs.
The most striking difference between ancient and modern sophists is that the ancients were satisfied with a passing victory of the argument at the expense of truth, whereas the moderns want a more lasting victory at the expense of reality
