A reference to another work of literature, person, or event
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ex:
Speech at the VA convention:
* “Suffer not yourselves to be betrayed with a kiss” (refernces to how Judas betrayed Jesus.)
* “Are we disposed to be of the number of those who, having eyes, see not, and having ears, hear not.” (references Ezekiel.)
* “The battle, sir, is not to the strong alone;”. (references Ecclesiastes.)
* “We are apt to shut our eyes against a painful truth, and listen to the song of that siren, till she transforms us into beasts.” (refernces to mythology.