Our proudest boast has been a system that makes belief in the unorthodox a permissible way of life. It is not because we want to destroy existing institutions, nor to undermine an orthodox faith that we make room for revolutionary ideas. Ideas, like the people who have them, need expression. The market place tests them—accepting a few, rejecting many. It is the interchange of ideas, the challenge to prejudices that give any people the resiliency to meet changing conditions.
Describe the tension the author refers to here.