It is known from her letters dated October 1902 to Abendanon and her husband that at the age of 23, Raden Adjeng Kartini had a mind to live a vegetarian life.
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She also read De Stille Kracht (The Hidden Force) by Louis Couperus, the works of Frederik van Eeden, Augusta de Witt, the Romantic-Feminist author Goekoop de-Jong Van Eek and an anti-war novel by Berta von Suttner, Die Waffen Nieder! (Lay Down Your Arms!).
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Raden Adjeng Kartini (1920), Letters of a Javanese princess, translated by Agnes Louise Symmers with a foreword by Louis Couperus, New York: Alfred A. Knopf, ISBN 0-8191-4758-3 (1986 edition), ISBN 1-4179-5105-2 (2005 edition)