A History of Greek Philosophy: The fifth-century enlightenment

according Aeschylus agree already Antiphon Antisthenes appears argument Aristotle Athenian Athens believed better body called century character claim common course criticism death definition described dialogue discussion divine doctrine doubt effect equally ethical Euripides evidence example existence expressed fact friends give gods Gorgias Greek hand Hippias historical human idea interest justice knowledge later laws learned least living matter means mentioned mind moral nature never nomos object opinion origin passage philosophers Plato pleasure political positive possible practical present probably Prodicus Protagoras pupil question quoted reason reference relation rhetoric says seems sense simply Socrates Socrates's Sophists speaks speech suggests teaching theory things thought true truth turn universal virtue whole writing written wrong Xenophon young