The aim of my paper is to interpret S. Kierkegaard's concept of a leap as a metaphor for the process of moving from one conceptual scheme to another. The basis for this reading of the concept is provided by the growing recognition of Kierkegaard's philosophy as dealing with conceptual schemes, equipements or paradigms through which reality is interpreted. I use Kierkegaard's metaphor as a point of departure for the analysis of the conditions of possibility and the very process of changing (...) conteptual schemes in general. I use the story of Abraham and Isaac, as described in „Fear and Trembling”, as a source of examples illustrating more general points I make during my analysis. Firstly, I present a general understanding of what a conceptual scheme is and how it is functioning. Afterwards, I show how this functioning is impaired in case of Abraham and Isaac. Finally, I put forward a hypothesis that the problems that Abraham's scheme is encountering due to God's demand to sacrifice Isaac can all be reduced to the fact that a very deep change in meaning of certain terms within the conceptual scheme, such as "God", "good" or "duty", has occured. The adoption of new meanings would be equivalent to moving into another conceptual scheme. (shrink)