I find myself just in the same situation of mind you describe as your own, heartily wishing the good, that is the quiet of my country, and hoping a total end of all the unhappy divisions of mankind by party-spirit, which at best is but the madness of many for the gain of a few.

Letter to Edward Blount (27 August 1714); a similar expression in "Thoughts on Various Subjects" in Swift's Miscellanies (1727): Party is the madness of many, for the gain of a few.