63 is an essay by James Madison, the sixty-third of The Federalist Papers.

62, it is the second of two essays detailing and justifying the organization of the United States Senate.

He argues that the Senate, a strong and the most stable member of the government, is needed to ensure lasting relations with foreign nations.

He also notes that because Senators are elected to six-year terms, they will have sufficient time to be responsible for their actions.

The Senate can also serve as a check on the people since, although during most times their will is just, they too are "subject to the [periodic] infection of violent passions."