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Practice in Christianity is a work by 19th century theologian Søren Kierkegaard. It was published on September 27, 1850 under the pseudonym Anti-Climacus, the author of The Sickness Unto Death. Kierkegaard considered it to be his "most perfect and truest book". In it, the theologian fully exposes his conception of the …

This book was described by Kierkegaard as an attack on modern speculative philosophy by "means of the melancholy irony, which did not consist in any single utterance on the part of Johannes Climacus but in his whole life. . . . Johannes does what we are told to do--he actually doubts everything--he suffers through all …