“Every man who loves peace, every man who loves his country, every man who loves liberty ought to have it ever before his eyes that he may cherish in his heart a due attachment to the Union of America and be able to set a due value on the means of preserving it.” -James Madison, Federalist No. 41, 1788

You may read Federalist No. 41 in its entirety here:

http://avalon.law.yale.edu/18th_century/fed41.asp