The militia is the natural ...

The militia is the natural defense of a free country against sudden foreign invasions, domestic insurrections, and domestic usurpations of power by rulers. It is against sound policy for a free people to keep up large military establishments and standing armies in time of peace, both from the enormous expenses, with which they are attended, and the facile means, which they afford to ambitious and unprincipled rulers, to subvert the government, or trample upon the rights of the people.
 Joseph Story

Quotes from the same author

The militia is the natural defense of a free country against sudden foreign invasions, domestic insurrections, and domestic usurpation of power by rulers. The right of the citizens to keep and bear arms has justly been considered, as the palladium of the liberties of the republic; since it offers a strong moral check against the usurpation and arbitrary power of rulers; and will generally ... enable the people to resist and triumph over them.
 Joseph Story
The right of the citizens to keep and bear arms has justly been considered as the palladium of the liberties of a republic.
 Joseph Story
One of the ordinary modes, by which tyrants accomplish their purposes without resistance, is, by disarming the people, and making it an offense to keep arms.
 Joseph Story
The duty imposed upon him [the president] to take care that the laws be faithfully executed, follows out the strong injunctions of his oath of office, that he will 'preserve, protect, and defend the Constitution.' The great object of the executive department is to accomplish this purpose; and without it, be the form of government whatever it may, it will be utterly worthless for offence or defense; for the redress of grievances or the protection of rights; for the happiness, or good order, or safety of the people.
 Joseph Story
One of the ordinary modes, by which tyrants accomplish their purposes without resistance, is, by disarming the people, and making it an offence to keep arms, and by substituting a regular army in the stead of a resort to the militia. The friends of a free government cannot be too watchful, to overcome the dangerous tendency of the public mind to sacrifice, for the sake of mere private convenience, this powerful check upon the designs of ambitious men.
 Joseph Story