In an 1897 Courier article, Cather quotes from the "Confessions" in a piece on objections to a statue of Heine in Brooklyn's Prospect Park.
In an 1898 Courier article, Cather quotes from the "Confessions" in a piece on the young runaway Adelaide Mould, daughter of the comic opera star Marion Manola.
In "Double Birthday," Dr. Albert Engelhardt protests about Marguerite Thiesinger's illness with the line "God is a grimmer humorist than I. Nobody but God could have perpetrated anything so cruel." March (348) suggests that this alludes to a passage near the end of Heine's Confessions.
In an 1896 Journal article, Cather quotes a passage in an essay on various stage adaptations of Scenes de la vie de Boheme by Henri Murger.