Read the excerpt from A Vindication of the Rights of Woman. In this style, argue tyrants of every denomination, from the weak king to the weak father of a family; they are all eager to crush reason; yet always assert that they usurp its throne only to be useful. Do you not act a similar part, when you force all women, by denying them civil and political rights, to remain immured in their families groping in the dark? For surely, Sir, you will not assert, that a duty can be binding which is not founded on reason? If indeed this be their destination, arguments may be drawn from reason: and thus augustly supported, the more understanding women acquire, the more they will be attached to their duty—comprehending it—for unless they comprehend it, unless their morals be fixed on the same immutable principle as those of man, no authority can make them discharge it in a virtuous manner. What is the central idea of the excerpt?