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The Diary covers the important elements in Kierkegaard's life, including his childhood, his relations with his father, the influence of other writers on him, his broken engagement (which had a far-reaching effect on the rest of his life), and his celebrated quarrel with the Church.
Kierkegaard's writings are important because he is almost the first European writer to take a modern, analytical, psychological approach to religion. Proust, Joyce, and Aldous Huxley were only a few of the modern writers influenced by the Dane; and Jean-Paul Sartre's philosophy of existentialism is based on his thinking.