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Let me now warn you in the most solemn manner against the baneful effects of the spirit of party. The common and continual mischiefs of the spirit of party are sufficient to make it the interest and duty of a wise people to discourage and restrain it. It serves always to distract the public councils and enfeeble the public administration. It agitates the community with ill-founded jealousies and false alarms; kindles the animosity of one part against another. In governments purely elective, it is a spirit not to be encouraged.

George Washington’s "Farewell Address", oll.libertyfund.org. September 19, 1796.
Let me now warn you in the most solemn manner against the baneful effects of the spirit of party. The common and continual mischiefs of the spirit of party are sufficient to make it the interest and duty of a wise