"[of Kierkegaard's behavior towards his ex-fiance Regine] There isn't the slightest reason to condemn him, but every call to attempt to understand him". "[Kierkegaard is] the mystery, the great mystery".
Notes from Wikiquote
Søren Kierkegaard: A Critical Presentation in Outline (Søren Kierkegaard: En kritisk Fremstilling i Grundrids) (1877). Quoted in the Los Angeles Review of Books, 9 April 2014