What does Captain Beatty say abuyt the quotation when they return to the firehouse, and what does the incident show?

“We must all be alike. Not everyone born free and equal, as the Constitution says, but everyone made equal. Each man the image of every other; then all are happy, for there are no mountains to make them cower, to judge themselves against. So! A book is a loaded gun in the house next door. Burn it. Take the shot from the weapon.” — Captain Beatty from Fahrenheit 451, and this incident shows the power of the state to suppress unique thought and action.