They (i. e., the Pythagoreans) did not advocate the free confrontation of conflicting points of view… — Carl Sagan

They (i. e., the Pythagoreans) did not advocate the free confrontation of conflicting points of view. Instead, like all orthodox religions, they practised a rigidity that prevented them from correcting their errors.

p. 184Source: Wikiquote · CC BY-SA 4.0