Frequent elections are ...

Frequent elections are unquestionably the only policy by which this dependence and sympathy can be effectually secured. But what particular degree of frequency may be absolutely necessary for the purpose, does not appear to be susceptible of any precise calculation; and must depend on a variety of circumstances with which it may be connected. Let us consult experience, the guide that ought always to be followed, whenever it can be found.
Frequent elections are unquestionably the only policy by which this dependence and sympathy can be effectually secured. But what particular degree of frequency may be absolutely necessary for the purpose, does not appear to be susceptible of any precise calculation; and must depend on a variety of circumstances with which it may be connected. Let us consult experience, the guide that ought always to be followed, whenever it can be found.
 James Madison

Quotes from the same author

Besides the advantage of being armed, which the Americans possess over the people of almost every other nation.... Notwithstanding the military establishments in the several kingdoms of Europe, which are carried as far as the public resources will bear, the governments are afraid to trust the people with arms.
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 James Madison
Besides the advantage of being armed, which the Americans possess over the people of almost every other nation, the existence of subordinate governments, to which the people are attached, and by which the militia officers are appointed, forms a barrier against the enterprises of ambition, more insurmountable than any which a simple government of any form can admit of.
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 James Madison
The ultimate authority, wherever the derivative may be found, resides in the people alone, and that it will not depend merely on the comparative ambition or address of the different governments, whether either, or which of them, will be able to enlarge its sphere of jurisdiction at the expense of the other.
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 James Madison
Americans have the right and advantage of being armed - unlike the citizens of other countries whose governments are afraid to trust the people with arms.
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 James Madison
It is not certain that with this aid alone [possession of arms], they would not be able to shake off their yokes. But were the people to posses the additional advantages of local governments chosen by themselves, who could collect the national will, and direct the national force; and of officers appointed out of the militia, by these governments and attached both to them and to the militia, it may be affirmed with the greatest assurance, that the throne of every tyranny in Europe would be speedily overturned, in spite of the legions which surround it.
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 James Madison