Theoetetus's Argument for False Belief

Socrates says that even if protagoras agrees with the doctrine, socrates does not. So it will be true for socrates that protagoras doctrine is false. This leads to another major theme of this dialogue - the possibility of false belief. Theoetetus accepts that knowledge is not perception and makes another suggestion. Perhaps knowledge is having a true belief,. And obviously it can't be false belief.