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My sister and I, you will recollect, were twins, and you know how subtle are the links which bind two souls which are so closely allied.
—Sir Arthur Conan Doyle (1859–1930)

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An alliance is like a chain. It is not made stronger by adding weak links to it. A great power like the United States gains no advantage and it loses prestige by offering, indeed peddling, its alliances to all and sundry. An alliance should be hard diplomatic currency, valuable and hard to get, and not inflationary paper from the mimeograph machine in the State Department.
—Walter Lippmann (1889–1974)