Faith is to him the highest actual passion, which, thrilled by the consciousness of sin and guilt, appropriates to itself the paradox in defiance of the understanding, and from which all comprehension, all contemplation are excluded, as it is of a purely practical nature, a mere act of the will.
Kierkegaard argued about this in both Repetition and Fear and Trembling where he said philosophy must not define faith.
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A quotation concerning Tarquinius and the poppy allegory appears in Kierkegaard's Fear and Trembling.