In philosophy, a leap of faith is the act of believing in or accepting something not on the basis of reason. The phrase is commonly associated with Danish philosopher Søren Kierkegaard.
Idiomatic usage As an idiom, leap of faith can refer to the act of believing something that is unprovable. The term can also refer to a risky thing a person does in hopes of a positive outcome.
Background The phrase is commonly attributed to Søren Kierkegaard, though he never used the term "leap of faith", but instead referred to a "qualitative leap".
The implication of taking a leap of faith can, depending on the context, carry positive or negative connotations, as some feel it is a virtue to be able to believe in something without evidence while others feel it is foolishness, as is presented in Fear and Trembling on Abraham's figure when God demands the sacrifice of his son Isaac: If Abraham had doubted as he stood there on Mount Moriah, if irresolute he had looked around, if he had happened to spot the ram before drawing the knife, if God had allowed him to sacrifice it instead of Isaac—then he would have gone home, everything would have been the same, he would have had Sarah, he would have kept Isaac, and yet how changed!
Development of concept by Kierkegaard
A leap of faith, according to Kierkegaard, involves circularity as the leap is made by faith. In his book Concluding Unscientific Postscript, Kierkegaard describes the leap: "Thinking can turn toward itself in order to think about itself and skepticism can emerge. But this thinking about itself never accomplishes anything." Kierkegaard says thinking should serve by thinking something. Kierkegaard wants to stop "thinking's self-reflection" and that is the movement that constitutes a leap. Kierkegaard was an orthodox Scandinavian Lutheran in conflict with the liberal theological establishment of his day. His works included the orthodox Lutheran conception of a God that unconditionally accepts man, faith itself being a gift from God, and that the highest moral position is reached when a person realizes this and, no longer depending upon her or himself, takes the leap of faith into the arms of a loving God. Kierkegaard describes "the leap" using the story of Adam and Eve, particularly Adam's qualitative "leap" into sin. Adam's leap signifies a change from one quality to another—the quality of possessing no sin to the quality of possessing sin. Kierkegaard writes that the transition from one quality to another can take place only by a "leap". When the transition happens, one moves directly from one state to the other, never possessing both qualities. Kierkegaard wrote, "In the Moment man becomes conscious that he is born; for his antecedent state, to which he may not cling, was one of non-being." Kierkegaard felt that a leap of faith was vital in accepting Christianity due to the paradoxes that exist in Christianity. In his books Philosophical Fragments and Concluding Unscientific Postscript Kierkegaard delves deeply into the paradoxes that Christianity presents. In describing the leap, Kierkegaard agreed with Gotthold Ephraim Lessing. Kierkegaard's use of the term "leap" was in response to "Lessing's Ditch" which was discussed by Lessing in his theological writings. Both Lessing and Kierkegaard discuss the agency one might use to base one's faith upon. Lessing tried to battle rational Christianity directly and, when that failed, he battled it indirectly through what Kierkegaard called "imaginary constructions". Both were influenced by Jean-Jacques Rousseau. In 1950, philosopher Vincent Edward Smith wrote that "Lessing and Kierkegaard declare in typical fashion that there is no bridge between historical, finite knowledge and God's existence and nature." In 1846, Kierkegaard wrote, "The leap becomes easier in the degree to which some distance intervenes between the initial position and the place where the leap takes off. And so it is also with respect to a decisive movement in the realm of the spirit. The most difficult decisive action is not that in which the individual is far removed from the decision (as when a non-Christian is about to decide to become one), but when it is as if the matter were already decided."
Suppose that [Friedrich Heinrich] Jacobi himself has made the leap; suppose that with the aid of eloquence he manages to persuade a learner to want to do it. Then the learner has a direct relation to Jacobi and consequently does not himself come to make the leap. The direct relation between one human being and another is naturally much easier and gratifies one’s sympathies and one’s own need much more quickly and ostensibly more reliable.
Interpretation by other philosophers Immanuel Kant used the term "leap" in his 1784 essay, Answering the Question: What is Enlightenment?, writing: "Dogmas and formulas, these mechanical tools designed for reasonable use—or rather abuse—of his natural gifts, are the fetters of an everlasting nonage. The man who casts them off would make an uncertain leap over the narrowest ditch, because he is not used to such free movement. That is why there are only a few men who walk firmly, and who have emerged from nonage by cultivating their own minds." Some theistic realms of thought do not agree with the implications that this phrase carries. C. S. Lewis argues against the idea that Christianity requires a "leap of faith". One of Lewis' arguments is that supernaturalism, a basic tenet of Christianity, can be logically inferred based on a teleological argument regarding the source of human reason. Some Christians are less critical of the term and do accept that religion requires a "leap of faith". Friedrich Heinrich Jacobi, Georg Wilhelm Friedrich Hegel, and C. S. Lewis wrote about Christianity in accordance with their understanding. Kierkegaard was of the opinion that faith was unexplainable and inexplicable. The more a person tries to explain personal faith to another, the more entangled that person becomes in language and semantics but "recollection" is "das Zugleich, the all-at-once," that always brings him back to himself. In the 1916 article "The Anti-Intellectualism of Kierkegaard", David F. Swenson wrote:
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