Who was the greek teacher who told his students to question everything they were told?

Question

I believe one ancient greek teacher really stressed the idea to his students that they should question everything they were told, does anyone know who he was?

Answer 1

It was Socrates. The Socratic method, was one of of leading himself and others to understanding through questioning and dialog. Such a process which required the participants to clarify their beliefs and understanding. His favorite approach was to lead the protagonist into argument while pretending his own ignorance of the matter, a technique known as Socratic irony. He was master of the negative dialectic, better at destroying the definition and propositions of others than offering his own.

Answer 2

It was Socrates. I love that Bill & Ted movie.

Answer 3

Socrates and Pythagoras ,although I have some reservations about Socrates because his favorite method to teach his student was by make questions to them . This  is the Socratic method

Answer 4

It's both Socrates and Descartes that taught that